comparison mercurial/localrepo.py @ 43076:2372284d9457

formatting: blacken the codebase

This is using my patch to black
(https://github.com/psf/black/pull/826) so we don't un-wrap collection
literals.

Done with:

  hg files 'set:**.py - mercurial/thirdparty/** - "contrib/python-zstandard/**"' | xargs black -S

# skip-blame mass-reformatting only

# no-check-commit reformats foo_bar functions

Differential Revision: https://phab.mercurial-scm.org/D6971

43075:57875cf423c9

from .utils import (
    procutil,
    stringutil,
)

from .revlogutils import (
    constants as revlogconst,
)

release = lockmod.release
urlerr = util.urlerr
urlreq = util.urlreq

# set of (path, vfs-location) tuples. vfs-location is:
# - 'plain for vfs relative paths
# - '' for svfs relative paths
_cachedfiles = set()

class _basefilecache(scmutil.filecache):
    """All filecache usage on repo are done for logic that should be unfiltered
    """
    def __get__(self, repo, type=None):
        if repo is None:
            return self
        # proxy to unfiltered __dict__ since filtered repo has no entry
        unfi = repo.unfiltered()

        return super(_basefilecache, self).__get__(unfi, type)

    def set(self, repo, value):
        return super(_basefilecache, self).set(repo.unfiltered(), value)

class repofilecache(_basefilecache):
    """filecache for files in .hg but outside of .hg/store"""
    def __init__(self, *paths):
        super(repofilecache, self).__init__(*paths)
        for path in paths:
            _cachedfiles.add((path, 'plain'))

    def join(self, obj, fname):
        return obj.vfs.join(fname)

class storecache(_basefilecache):
    """filecache for files in the store"""
    def __init__(self, *paths):
        super(storecache, self).__init__(*paths)
        for path in paths:
            _cachedfiles.add((path, ''))

    def join(self, obj, fname):
        return obj.sjoin(fname)

class mixedrepostorecache(_basefilecache):
    """filecache for a mix files in .hg/store and outside"""
    def __init__(self, *pathsandlocations):
        # scmutil.filecache only uses the path for passing back into our
        # join(), so we can safely pass a list of paths and locations
        super(mixedrepostorecache, self).__init__(*pathsandlocations)
        _cachedfiles.update(pathsandlocations)

        fname, location = fnameandlocation
        if location == 'plain':
            return obj.vfs.join(fname)
        else:
            if location != '':
                raise error.ProgrammingError('unexpected location: %s' %
                                             location)
            return obj.sjoin(fname)

def isfilecached(repo, name):
    """check if a repo has already cached "name" filecache-ed property

    This returns (cachedobj-or-None, iscached) tuple.

    cacheentry = repo.unfiltered()._filecache.get(name, None)
    if not cacheentry:
        return None, False
    return cacheentry.obj, True

class unfilteredpropertycache(util.propertycache):
    """propertycache that apply to unfiltered repo only"""

    def __get__(self, repo, type=None):
        unfi = repo.unfiltered()
        if unfi is repo:
            return super(unfilteredpropertycache, self).__get__(unfi)
        return getattr(unfi, self.name)

class filteredpropertycache(util.propertycache):
    """propertycache that must take filtering in account"""

    def cachevalue(self, obj, value):
        object.__setattr__(obj, self.name, value)

def hasunfilteredcache(repo, name):
    """check if a repo has an unfilteredpropertycache value for <name>"""
    return name in vars(repo.unfiltered())

def unfilteredmethod(orig):
    """decorate method that always need to be run on unfiltered version"""
    def wrapper(repo, *args, **kwargs):
        return orig(repo.unfiltered(), *args, **kwargs)
    return wrapper

moderncaps = {'lookup', 'branchmap', 'pushkey', 'known', 'getbundle',
              'unbundle'}
legacycaps = moderncaps.union({'changegroupsubset'})

@interfaceutil.implementer(repository.ipeercommandexecutor)
class localcommandexecutor(object):
    def __init__(self, peer):
        self._peer = peer

    def __exit__(self, exctype, excvalue, exctb):
        self.close()

    def callcommand(self, command, args):
        if self._sent:
            raise error.ProgrammingError('callcommand() cannot be used after '
                                         'sendcommands()')

        if self._closed:
            raise error.ProgrammingError('callcommand() cannot be used after '
                                         'close()')

        # We don't need to support anything fancy. Just call the named
        # method on the peer and return a resolved future.
        fn = getattr(self._peer, pycompat.sysstr(command))

        self._sent = True

    def close(self):
        self._closed = True

@interfaceutil.implementer(repository.ipeercommands)
class localpeer(repository.peer):
    '''peer for a local repo; reflects only the most recent API'''

    def __init__(self, repo, caps=None):

    def clonebundles(self):
        return self._repo.tryread('clonebundles.manifest')

    def debugwireargs(self, one, two, three=None, four=None, five=None):
        """Used to test argument passing over the wire"""
        return "%s %s %s %s %s" % (one, two, pycompat.bytestr(three),
                                   pycompat.bytestr(four),
                                   pycompat.bytestr(five))

    def getbundle(self, source, heads=None, common=None, bundlecaps=None,
                  **kwargs):
        chunks = exchange.getbundlechunks(self._repo, source, heads=heads,
                                          common=common, bundlecaps=bundlecaps,
                                          **kwargs)[1]
        cb = util.chunkbuffer(chunks)

        if exchange.bundle2requested(bundlecaps):
            # When requesting a bundle2, getbundle returns a stream to make the
            # wire level function happier. We need to build a proper object

    def pushkey(self, namespace, key, old, new):
        return self._repo.pushkey(namespace, key, old, new)

    def stream_out(self):
        raise error.Abort(_('cannot perform stream clone against local '
                            'peer'))

    def unbundle(self, bundle, heads, url):
        """apply a bundle on a repo

        This function handles the repo locking itself."""

                    stream = util.chunkbuffer(bundler.getchunks())
                    b = bundle2.getunbundler(self.ui, stream)
                    bundle2.processbundle(self._repo, b)
                raise
        except error.PushRaced as exc:
            raise error.ResponseError(_('push failed:'),
                                      stringutil.forcebytestr(exc))

    # End of _basewirecommands interface.

    # Begin of peer interface.

    def commandexecutor(self):
        return localcommandexecutor(self)

    # End of peer interface.

@interfaceutil.implementer(repository.ipeerlegacycommands)
class locallegacypeer(localpeer):
    '''peer extension which implements legacy methods too; used for tests with
    restricted capabilities'''

    def branches(self, nodes):
        return self._repo.branches(nodes)

    def changegroup(self, nodes, source):
        outgoing = discovery.outgoing(self._repo, missingroots=nodes,
                                      missingheads=self._repo.heads())
        return changegroup.makechangegroup(self._repo, outgoing, '01', source)

    def changegroupsubset(self, bases, heads, source):
        outgoing = discovery.outgoing(self._repo, missingroots=bases,
                                      missingheads=heads)
        return changegroup.makechangegroup(self._repo, outgoing, '01', source)

    # End of baselegacywirecommands interface.

# Increment the sub-version when the revlog v2 format changes to lock out old
# clients.
REVLOGV2_REQUIREMENT = 'exp-revlogv2.1'

#
# The function receives a set of requirement strings that the repository
# is capable of opening. Functions will typically add elements to the
# set to reflect that the extension knows how to handle that requirements.
featuresetupfuncs = set()

def makelocalrepository(baseui, path, intents=None):
    """Create a local repository object.

    Given arguments needed to construct a local repository, this function

            sharedpath = hgvfs.join(sharedpath)

        sharedvfs = vfsmod.vfs(sharedpath, realpath=True)

        if not sharedvfs.exists():
            raise error.RepoError(_(b'.hg/sharedpath points to nonexistent '
                                    b'directory %s') % sharedvfs.base)

        features.add(repository.REPO_FEATURE_SHARED_STORAGE)

        storebasepath = sharedvfs.base
        cachepath = sharedvfs.join(b'cache')
    else:
        storebasepath = hgvfs.base
        cachepath = hgvfs.join(b'cache')
    wcachepath = hgvfs.join(b'wcache')


    # The store has changed over time and the exact layout is dictated by
    # requirements. The store interface abstracts differences across all
    # of them.
    store = makestore(requirements, storebasepath,
                      lambda base: vfsmod.vfs(base, cacheaudited=True))
    hgvfs.createmode = store.createmode

    storevfs = store.vfs
    storevfs.options = resolvestorevfsoptions(ui, requirements, features)

    extrastate = {}

    for iface, fn in REPO_INTERFACES:
        # We pass all potentially useful state to give extensions tons of
        # flexibility.
        typ = fn()(ui=ui,
                 intents=intents,
                 requirements=requirements,
                 features=features,
                 wdirvfs=wdirvfs,
                 hgvfs=hgvfs,
                 store=store,
                 storevfs=storevfs,
                 storeoptions=storevfs.options,
                 cachevfs=cachevfs,
                 wcachevfs=wcachevfs,
                 extensionmodulenames=extensionmodulenames,
                 extrastate=extrastate,
                 baseclasses=bases)

        if not isinstance(typ, type):
            raise error.ProgrammingError('unable to construct type for %s' %
                                         iface)

        bases.append(typ)

    # type() allows you to use characters in type names that wouldn't be
    # recognized as Python symbols in source code. We abuse that to add
    # rich information about our constructed repo.
    name = pycompat.sysstr(b'derivedrepo:%s<%s>' % (
        wdirvfs.base,
        b','.join(sorted(requirements))))

    cls = type(name, tuple(bases), {})

    return cls(
        baseui=baseui,

        sharedpath=storebasepath,
        store=store,
        cachevfs=cachevfs,
        wcachevfs=wcachevfs,
        features=features,
        intents=intents)

def loadhgrc(ui, wdirvfs, hgvfs, requirements):
    """Load hgrc files/content into a ui instance.

    This is called during repository opening to load any additional

        ui.readconfig(hgvfs.join(b'hgrc'), root=wdirvfs.base)
        return True
    except IOError:
        return False

def afterhgrcload(ui, wdirvfs, hgvfs, requirements):
    """Perform additional actions after .hg/hgrc is loaded.

    This function is called during repository loading immediately after
    the .hg/hgrc file is loaded and before per-repo extensions are loaded.

            continue

        for name in names:
            if not ui.hasconfig(b'extensions', name):
                ui.setconfig(b'extensions', name, b'', source='autoload')

def gathersupportedrequirements(ui):
    """Determine the complete set of recognized requirements."""
    # Start with all requirements supported by this file.
    supported = set(localrepository._basesupported)

            if engine.name() == 'zstd':
                supported.add(b'revlog-compression-zstd')

    return supported

def ensurerequirementsrecognized(requirements, supported):
    """Validate that a set of local requirements is recognized.

    Receives a set of requirements. Raises an ``error.RepoError`` if there
    exists any requirement in that set that currently loaded code doesn't

        missing.add(requirement)

    if missing:
        raise error.RequirementError(
            _(b'repository requires features unknown to this Mercurial: %s') %
            b' '.join(sorted(missing)),
            hint=_(b'see https://mercurial-scm.org/wiki/MissingRequirement '
                   b'for more information'))

def ensurerequirementscompatible(ui, requirements):
    """Validates that a set of recognized requirements is mutually compatible.

    Some requirements may not be compatible with others or require

    checking.

    ``error.RepoError`` should be raised on failure.
    """
    if b'exp-sparse' in requirements and not sparse.enabled:
        raise error.RepoError(_(b'repository is using sparse feature but '
                                b'sparse is not enabled; enable the '
                                b'"sparse" extensions to access'))

def makestore(requirements, path, vfstype):
    """Construct a storage object for a repository."""
    if b'store' in requirements:
        if b'fncache' in requirements:
            return storemod.fncachestore(path, vfstype,
                                         b'dotencode' in requirements)

        return storemod.encodedstore(path, vfstype)

    return storemod.basicstore(path, vfstype)

def resolvestorevfsoptions(ui, requirements, features):
    """Resolve the options to pass to the store vfs opener.

    The returned dict is used to influence behavior of the storage layer.

    # This revlog format is super old and we don't bother trying to parse
    # opener options for it because those options wouldn't do anything
    # meaningful on such old repos.
    if b'revlogv1' in requirements or REVLOGV2_REQUIREMENT in requirements:
        options.update(resolverevlogstorevfsoptions(ui, requirements, features))
    else: # explicitly mark repo as using revlogv0
        options['revlogv0'] = True

    writecopiesto = ui.config('experimental', 'copies.write-to')
    copiesextramode = ('changeset-only', 'compatibility')
    if (writecopiesto in copiesextramode):
        options['copies-storage'] = 'extra'

    return options

def resolverevlogstorevfsoptions(ui, requirements, features):
    """Resolve opener options specific to revlogs."""

    options = {}

    # experimental config: format.chunkcachesize
    chunkcachesize = ui.configint(b'format', b'chunkcachesize')
    if chunkcachesize is not None:
        options[b'chunkcachesize'] = chunkcachesize

    deltabothparents = ui.configbool(b'storage',
                                     b'revlog.optimize-delta-parent-choice')
    options[b'deltabothparents'] = deltabothparents

    lazydelta = ui.configbool(b'storage', b'revlog.reuse-external-delta')
    lazydeltabase = False
    if lazydelta:
        lazydeltabase = ui.configbool(b'storage',
                                      b'revlog.reuse-external-delta-parent')
    if lazydeltabase is None:
        lazydeltabase = not scmutil.gddeltaconfig(ui)
    options[b'lazydelta'] = lazydelta
    options[b'lazydeltabase'] = lazydeltabase

    chainspan = ui.configbytes(b'experimental', b'maxdeltachainspan')
    if 0 <= chainspan:
        options[b'maxdeltachainspan'] = chainspan

    mmapindexthreshold = ui.configbytes(b'experimental',
                                        b'mmapindexthreshold')
    if mmapindexthreshold is not None:
        options[b'mmapindexthreshold'] = mmapindexthreshold

    withsparseread = ui.configbool(b'experimental', b'sparse-read')
    srdensitythres = float(ui.config(b'experimental',
                                     b'sparse-read.density-threshold'))
    srmingapsize = ui.configbytes(b'experimental',
                                  b'sparse-read.min-gap-size')
    options[b'with-sparse-read'] = withsparseread
    options[b'sparse-read-density-threshold'] = srdensitythres
    options[b'sparse-read-min-gap-size'] = srmingapsize

    sparserevlog = SPARSEREVLOG_REQUIREMENT in requirements

    if repository.NARROW_REQUIREMENT in requirements:
        options[b'enableellipsis'] = True

    return options

def makemain(**kwargs):
    """Produce a type conforming to ``ilocalrepositorymain``."""
    return localrepository

@interfaceutil.implementer(repository.ilocalrepositoryfilestorage)
class revlogfilestorage(object):
    """File storage when using revlogs."""

    def file(self, path):
        if path[0] == b'/':
            path = path[1:]

        return filelog.filelog(self.svfs, path)

@interfaceutil.implementer(repository.ilocalrepositoryfilestorage)
class revlognarrowfilestorage(object):
    """File storage when using revlogs and narrow files."""

    def file(self, path):
        if path[0] == b'/':
            path = path[1:]

        return filelog.narrowfilelog(self.svfs, path, self._storenarrowmatch)

def makefilestorage(requirements, features, **kwargs):
    """Produce a type conforming to ``ilocalrepositoryfilestorage``."""
    features.add(repository.REPO_FEATURE_REVLOG_FILE_STORAGE)
    features.add(repository.REPO_FEATURE_STREAM_CLONE)

    if repository.NARROW_REQUIREMENT in requirements:
        return revlognarrowfilestorage
    else:
        return revlogfilestorage

# List of repository interfaces and factory functions for them. Each
# will be called in order during ``makelocalrepository()`` to iteratively
# derive the final type for a local repository instance. We capture the
# function as a lambda so we don't hold a reference and the module-level
# functions can be wrapped.
REPO_INTERFACES = [
    (repository.ilocalrepositorymain, lambda: makemain),
    (repository.ilocalrepositoryfilestorage, lambda: makefilestorage),
]

@interfaceutil.implementer(repository.ilocalrepositorymain)
class localrepository(object):
    """Main class for representing local repositories.

        'fncache',
        'shared',
        'relshared',
        'dotencode',
        'exp-sparse',
        'internal-phase'
    }

    # list of prefix for file which can be written without 'wlock'
    # Extensions should extend this list when needed
    _wlockfreeprefix = {

        # this changeset was introduced. Someone should fix
        # the remainig bit and drop this line
        'bisect.state',
    }

    def __init__(self, baseui, ui, origroot, wdirvfs, hgvfs, requirements,
                 supportedrequirements, sharedpath, store, cachevfs, wcachevfs,
                 features, intents=None):
        """Create a new local repository instance.

        Most callers should use ``hg.repository()``, ``localrepo.instance()``,
        or ``localrepo.makelocalrepository()`` for obtaining a new repository
        object.

        self.wcachevfs = wcachevfs
        self.features = features

        self.filtername = None

        if (self.ui.configbool('devel', 'all-warnings') or
            self.ui.configbool('devel', 'check-locks')):
            self.vfs.audit = self._getvfsward(self.vfs.audit)
        # A list of callback to shape the phase if no data were found.
        # Callback are in the form: func(repo, roots) --> processed root.
        # This list it to be filled by extension during repo setup
        self._phasedefaults = []

        color.setup(self.ui)

        self.spath = self.store.path
        self.svfs = self.store.vfs
        self.sjoin = self.store.join
        if (self.ui.configbool('devel', 'all-warnings') or
            self.ui.configbool('devel', 'check-locks')):
            if util.safehasattr(self.svfs, 'vfs'): # this is filtervfs
                self.svfs.vfs.audit = self._getsvfsward(self.svfs.vfs.audit)
            else: # standard vfs
                self.svfs.audit = self._getsvfsward(self.svfs.audit)

        self._dirstatevalidatewarned = False

        self._branchcaches = branchmap.BranchMapCache()

        self._extrafilterid = repoview.extrafilter(ui)

    def _getvfsward(self, origfunc):
        """build a ward for self.vfs"""
        rref = weakref.ref(self)
        def checkvfs(path, mode=None):
            ret = origfunc(path, mode=mode)
            repo = rref()
            if (repo is None
                or not util.safehasattr(repo, '_wlockref')
                or not util.safehasattr(repo, '_lockref')):
                return
            if mode in (None, 'r', 'rb'):
                return
            if path.startswith(repo.path):
                # truncate name relative to the repository (.hg)
                path = path[len(repo.path) + 1:]
            if path.startswith('cache/'):
                msg = 'accessing cache with vfs instead of cachevfs: "%s"'
                repo.ui.develwarn(msg % path, stacklevel=3, config="cache-vfs")
            if path.startswith('journal.') or path.startswith('undo.'):
                # journal is covered by 'lock'
                if repo._currentlock(repo._lockref) is None:
                    repo.ui.develwarn('write with no lock: "%s"' % path,
                                      stacklevel=3, config='check-locks')
            elif repo._currentlock(repo._wlockref) is None:
                # rest of vfs files are covered by 'wlock'
                #
                # exclude special files
                for prefix in self._wlockfreeprefix:
                    if path.startswith(prefix):
                        return
                repo.ui.develwarn('write with no wlock: "%s"' % path,
                                  stacklevel=3, config='check-locks')
            return ret
        return checkvfs

    def _getsvfsward(self, origfunc):
        """build a ward for self.svfs"""
        rref = weakref.ref(self)
        def checksvfs(path, mode=None):
            ret = origfunc(path, mode=mode)
            repo = rref()
            if repo is None or not util.safehasattr(repo, '_lockref'):
                return
            if mode in (None, 'r', 'rb'):
                return
            if path.startswith(repo.sharedpath):
                # truncate name relative to the repository (.hg)
                path = path[len(repo.sharedpath) + 1:]
            if repo._currentlock(repo._lockref) is None:
                repo.ui.develwarn('write with no lock: "%s"' % path,
                                  stacklevel=4)
            return ret
        return checksvfs

    def close(self):
        self._writecaches()

            self._revbranchcache.write()

    def _restrictcapabilities(self, caps):
        if self.ui.configbool('experimental', 'bundle2-advertise'):
            caps = set(caps)
            capsblob = bundle2.encodecaps(bundle2.getrepocaps(self,
                                                              role='client'))
            caps.add('bundle2=' + urlreq.quote(capsblob))
        return caps

    def _writerequirements(self):
        scmutil.writerequires(self.vfs, self.requirements)

    @property
    def nofsauditor(self):
        # This is only used by context.basectx.match in order to detect
        # files in subrepos.
        return pathutil.pathauditor(self.root, callback=self._checknested,
                                    realfs=False, cached=True)

    def _checknested(self, path):
        """Determine if path is a legal nested repository."""
        if not path.startswith(self.root):
            return False
        subpath = path[len(self.root) + 1:]
        normsubpath = util.pconvert(subpath)

        # XXX: Checking against the current working copy is wrong in
        # the sense that it can reject things like
        #

            if prefix in ctx.substate:
                if prefix == normsubpath:
                    return True
                else:
                    sub = ctx.sub(prefix)
                    return sub.checknested(subpath[len(prefix) + 1:])
            else:
                parts.pop()
        return False

    def peer(self):
        return localpeer(self) # not cached to avoid reference cycle

    def unfiltered(self):
        """Return unfiltered version of the repository

        Intended to be overwritten by filtered repo."""

        the "served" view, regardless of the initial view used by `repo`.

        In other word, there is always only one level of `repoview` "filtering".
        """
        if self._extrafilterid is not None and '%' not in name:
            name = name + '%'  + self._extrafilterid

        cls = repoview.newtype(self.unfiltered().__class__)
        return cls(self, name, visibilityexceptions)

    @mixedrepostorecache(('bookmarks', 'plain'), ('bookmarks.current', 'plain'),
                         ('bookmarks', ''), ('00changelog.i', ''))
    def _bookmarks(self):
        # Since the multiple files involved in the transaction cannot be
        # written atomically (with current repository format), there is a race
        # condition here.
        #

        self._refreshchangelog()
        return bookmarks.bmstore(self)

    def _refreshchangelog(self):
        """make sure the in memory changelog match the on-disk one"""
        if ('changelog' in vars(self) and self.currenttransaction() is None):
            del self.changelog

    @property
    def _activebookmark(self):
        return self._bookmarks.active

    def _makedirstate(self):
        """Extension point for wrapping the dirstate per-repo."""
        sparsematchfn = lambda: sparse.matcher(self)

        return dirstate.dirstate(self.vfs, self.ui, self.root,
                                 self._dirstatevalidate, sparsematchfn)

    def _dirstatevalidate(self, node):
        try:
            self.changelog.rev(node)
            return node
        except error.LookupError:
            if not self._dirstatevalidatewarned:
                self._dirstatevalidatewarned = True
                self.ui.warn(_("warning: ignoring unknown"
                               " working parent %s!\n") % short(node))
            return nullid

    @storecache(narrowspec.FILENAME)
    def narrowpats(self):
        """matcher patterns for this repository's narrowspec

            return context.workingctx(self)
        if isinstance(changeid, context.basectx):
            return changeid
        if isinstance(changeid, slice):
            # wdirrev isn't contiguous so the slice shouldn't include it
            return [self[i]
                    for i in pycompat.xrange(*changeid.indices(len(self)))
                    if i not in self.changelog.filteredrevs]
        try:
            if isinstance(changeid, int):
                node = self.changelog.node(changeid)
                rev = changeid
            elif changeid == 'null':

            elif len(changeid) == 20:
                try:
                    node = changeid
                    rev = self.changelog.rev(changeid)
                except error.FilteredLookupError:
                    changeid = hex(changeid) # for the error message
                    raise
                except LookupError:
                    # check if it might have come from damaged dirstate
                    #
                    # XXX we could avoid the unfiltered if we had a recognizable
                    # exception for filtered changeset access
                    if (self.local()
                        and changeid in self.unfiltered().dirstate.parents()):
                        msg = _("working directory has unknown parent '%s'!")
                        raise error.Abort(msg % short(changeid))
                    changeid = hex(changeid) # for the error message
                    raise

            elif len(changeid) == 40:
                node = bin(changeid)
                rev = self.changelog.rev(node)
            else:
                raise error.ProgrammingError(
                        "unsupported changeid '%s' of type %s" %
                        (changeid, type(changeid)))

            return context.changectx(self, rev, node)

        except (error.FilteredIndexError, error.FilteredLookupError):
            raise error.FilteredRepoLookupError(_("filtered revision '%s'")
                                                % pycompat.bytestr(changeid))
        except (IndexError, LookupError):
            raise error.RepoLookupError(
                _("unknown revision '%s'") % pycompat.bytestr(changeid))
        except error.WdirUnsupported:
            return context.workingctx(self)

    def __contains__(self, changeid):
        """True if the given changeid exists

        expand user aliases, specify ``user=True``. To provide some local
        definitions overriding user aliases, set ``localalias`` to
        ``{name: definitionstring}``.
        '''
        if user:
            m = revset.matchany(self.ui, specs,
                                lookup=revset.lookupfn(self),
                                localalias=localalias)
        else:
            m = revset.matchany(None, specs, localalias=localalias)
        return m(self)

    def url(self):

        # mq and bookmarks add tags, but do not set the tagtype at all.
        # Should each extension invent its own tag type?  Should there
        # be one tagtype for all such "virtual" tags?  Or is the status
        # quo fine?


        # map tag name to (node, hist)
        alltags = tagsmod.findglobaltags(self.ui, self)
        # map tag name to tag type
        tagtypes = dict((tag, 'global') for tag in alltags)

        tags = {}
        for (name, (node, hist)) in alltags.iteritems():
            if node != nullid:
                tags[encoding.tolocal(name)] = node
        tags['tip'] = self.changelog.tip()
        tagtypes = dict([(encoding.tolocal(name), value)
                         for (name, value) in tagtypes.iteritems()])
        return (tags, tagtypes)

    def tagtype(self, tagname):
        '''
        return the type of the given tag. result can be:

                        self.dirstate.copy(None, f)

    def filectx(self, path, changeid=None, fileid=None, changectx=None):
        """changeid must be a changeset revision, if specified.
           fileid can be a file revision or node."""
        return context.filectx(self, path, changeid, fileid,
                               changectx=changectx)

    def getcwd(self):
        return self.dirstate.getcwd()

    def pathto(self, f, cwd=None):

                fn = None
                params = cmd
                for name, filterfn in self._datafilters.iteritems():
                    if cmd.startswith(name):
                        fn = filterfn
                        params = cmd[len(name):].lstrip()
                        break
                if not fn:
                    fn = lambda s, c, **kwargs: procutil.filter(s, c)
                # Wrap old filters not supporting keyword arguments
                if not pycompat.getargspec(fn)[2]:

        """
        data = self._filter(self._decodefilterpats, filename, data)
        if 'l' in flags:
            self.wvfs.symlink(data, filename)
        else:
            self.wvfs.write(filename, data, backgroundclose=backgroundclose,
                            **kwargs)
            if 'x' in flags:
                self.wvfs.setflags(filename, False, True)
            else:
                self.wvfs.setflags(filename, False, False)
        return len(data)

        if tr and tr.running():
            return tr
        return None

    def transaction(self, desc, report=None):
        if (self.ui.configbool('devel', 'all-warnings')
                or self.ui.configbool('devel', 'check-locks')):
            if self._currentlock(self._lockref) is None:
                raise error.ProgrammingError('transaction requires locking')
        tr = self.currenttransaction()
        if tr is not None:
            return tr.nest(name=desc)

        # abort here if the journal already exists
        if self.svfs.exists("journal"):
            raise error.RepoError(
                _("abandoned transaction found"),
                hint=_("run 'hg recover' to clean up transaction"))

        idbase = "%.40f#%f" % (random.random(), time.time())
        ha = hex(hashlib.sha1(idbase).digest())
        txnid = 'TXN:' + ha
        self.hook('pretxnopen', throw=True, txnname=desc, txnid=txnid)

        renames = [(vfs, x, undoname(x)) for vfs, x in self._journalfiles()]
        if report:
            rp = report
        else:
            rp = self.ui.warn
        vfsmap = {'plain': self.vfs, 'store': self.svfs} # root of .hg/
        # we must avoid cyclic reference between repo and transaction.
        reporef = weakref.ref(self)
        # Code to track tag movement
        #
        # Since tags are all handled as file content, it is actually quite hard

        tracktags = lambda x: None
        # experimental config: experimental.hook-track-tags
        shouldtracktags = self.ui.configbool('experimental', 'hook-track-tags')
        if desc != 'strip' and shouldtracktags:
            oldheads = self.changelog.headrevs()
            def tracktags(tr2):
                repo = reporef()
                oldfnodes = tagsmod.fnoderevs(repo.ui, repo, oldheads)
                newheads = repo.changelog.headrevs()
                newfnodes = tagsmod.fnoderevs(repo.ui, repo, newheads)
                # notes: we compare lists here.
                # As we do it only once buiding set would not be cheaper
                changes = tagsmod.difftags(repo.ui, repo, oldfnodes, newfnodes)
                if changes:
                    tr2.hookargs['tag_moved'] = '1'
                    with repo.vfs('changes/tags.changes', 'w',
                                  atomictemp=True) as changesfile:
                        # note: we do not register the file to the transaction
                        # because we needs it to still exist on the transaction
                        # is close (for txnclose hooks)
                        tagsmod.writediff(changesfile, changes)
        def validate(tr2):
            """will run pre-closing hooks"""
            # XXX the transaction API is a bit lacking here so we take a hacky
            # path for now
            #

            # This will have to be fixed before we remove the experimental
            # gating.
            tracktags(tr2)
            repo = reporef()

            r = repo.ui.configsuboptions('experimental',
                                         'single-head-per-branch')
            singlehead, singleheadsub = r
            if singlehead:
                accountclosed = singleheadsub.get("account-closed-heads", False)
                scmutil.enforcesinglehead(repo, tr2, desc, accountclosed)
            if hook.hashook(repo.ui, 'pretxnclose-bookmark'):
                for name, (old, new) in sorted(tr.changes['bookmarks'].items()):
                    args = tr.hookargs.copy()
                    args.update(bookmarks.preparehookargs(name, old, new))
                    repo.hook('pretxnclose-bookmark', throw=True,
                              **pycompat.strkwargs(args))
            if hook.hashook(repo.ui, 'pretxnclose-phase'):
                cl = repo.unfiltered().changelog
                for rev, (old, new) in tr.changes['phases'].items():
                    args = tr.hookargs.copy()
                    node = hex(cl.node(rev))
                    args.update(phases.preparehookargs(node, old, new))
                    repo.hook('pretxnclose-phase', throw=True,
                              **pycompat.strkwargs(args))

            repo.hook('pretxnclose', throw=True,
                      **pycompat.strkwargs(tr.hookargs))
        def releasefn(tr, success):
            repo = reporef()
            if repo is None:
                # If the repo has been GC'd (and this release function is being
                # called from transaction.__del__), there's not much we can do,

                narrowspec.restorewcbackup(self, 'journal.narrowspec.dirstate')
                repo.dirstate.restorebackup(None, 'journal.dirstate')

                repo.invalidate(clearfilecache=True)

        tr = transaction.transaction(rp, self.svfs, vfsmap,
                                     "journal",
                                     "undo",
                                     aftertrans(renames),
                                     self.store.createmode,
                                     validator=validate,
                                     releasefn=releasefn,
                                     checkambigfiles=_cachedfiles,
                                     name=desc)
        tr.changes['origrepolen'] = len(self)
        tr.changes['obsmarkers'] = set()
        tr.changes['phases'] = {}
        tr.changes['bookmarks'] = {}

        tr.hookargs['txnname'] = desc
        # note: writing the fncache only during finalize mean that the file is
        # outdated when running hooks. As fncache is used for streaming clone,
        # this is not expected to break anything that happen during the hooks.
        tr.addfinalize('flush-fncache', self.store.write)
        def txnclosehook(tr2):
            """To be run if transaction is successful, will schedule a hook run
            """
            # Don't reference tr2 in hook() so we don't hold a reference.
            # This reduces memory consumption when there are multiple

                if hook.hashook(repo.ui, 'txnclose-bookmark'):
                    bmchanges = sorted(tr.changes['bookmarks'].items())
                    for name, (old, new) in bmchanges:
                        args = tr.hookargs.copy()
                        args.update(bookmarks.preparehookargs(name, old, new))
                        repo.hook('txnclose-bookmark', throw=False,
                                  **pycompat.strkwargs(args))

                if hook.hashook(repo.ui, 'txnclose-phase'):
                    cl = repo.unfiltered().changelog
                    phasemv = sorted(tr.changes['phases'].items())
                    for rev, (old, new) in phasemv:
                        args = tr.hookargs.copy()
                        node = hex(cl.node(rev))
                        args.update(phases.preparehookargs(node, old, new))
                        repo.hook('txnclose-phase', throw=False,
                                  **pycompat.strkwargs(args))

                repo.hook('txnclose', throw=False,
                          **pycompat.strkwargs(hookargs))
            reporef()._afterlock(hookfunc)
        tr.addfinalize('txnclose-hook', txnclosehook)
        # Include a leading "-" to make it happen before the transaction summary
        # reports registered via scmutil.registersummarycallback() whose names
        # are 00-txnreport etc. That way, the caches will be warm when the
        # callbacks run.
        tr.addpostclose('-warm-cache', self._buildcacheupdater(tr))
        def txnaborthook(tr2):
            """To be run if transaction is aborted
            """
            reporef().hook('txnabort', throw=False,
                           **pycompat.strkwargs(tr2.hookargs))
        tr.addabort('txnabort-hook', txnaborthook)
        # avoid eager cache invalidation. in-memory data should be identical
        # to stored data if transaction has no error.
        tr.addpostclose('refresh-filecachestats', self._refreshfilecachestats)
        self._transref = weakref.ref(tr)
        scmutil.registersummarycallback(self, tr, desc)
        return tr

    def _journalfiles(self):
        return ((self.svfs, 'journal'),
                (self.svfs, 'journal.narrowspec'),
                (self.vfs, 'journal.narrowspec.dirstate'),
                (self.vfs, 'journal.dirstate'),
                (self.vfs, 'journal.branch'),
                (self.vfs, 'journal.desc'),
                (bookmarks.bookmarksvfs(self), 'journal.bookmarks'),
                (self.svfs, 'journal.phaseroots'))

    def undofiles(self):
        return [(vfs, undoname(x)) for vfs, x in self._journalfiles()]

    @unfilteredmethod
    def _writejournal(self, desc):
        self.dirstate.savebackup(None, 'journal.dirstate')
        narrowspec.savewcbackup(self, 'journal.narrowspec.dirstate')
        narrowspec.savebackup(self, 'journal.narrowspec')
        self.vfs.write("journal.branch",
                          encoding.fromlocal(self.dirstate.branch()))
        self.vfs.write("journal.desc",
                          "%d\n%s\n" % (len(self), desc))
        bookmarksvfs = bookmarks.bookmarksvfs(self)
        bookmarksvfs.write("journal.bookmarks",
                           bookmarksvfs.tryread("bookmarks"))
        self.svfs.write("journal.phaseroots",
                           self.svfs.tryread("phaseroots"))

    def recover(self):
        with self.lock():
            if self.svfs.exists("journal"):
                self.ui.status(_("rolling back interrupted transaction\n"))
                vfsmap = {'': self.svfs,
                          'plain': self.vfs,}
                transaction.rollback(self.svfs, vfsmap, "journal",
                                     self.ui.warn,
                                     checkambigfiles=_cachedfiles)
                self.invalidate()
                return True
            else:
                self.ui.warn(_("no interrupted transaction available\n"))
                return False

                self.ui.warn(_("no rollback information available\n"))
                return 1
        finally:
            release(dsguard, lock, wlock)

    @unfilteredmethod # Until we get smarter cache management
    def _rollback(self, dryrun, force, dsguard):
        ui = self.ui
        try:
            args = self.vfs.read('undo.desc').splitlines()
            (oldlen, desc, detail) = (int(args[0]), args[1], None)
            if len(args) >= 3:
                detail = args[2]
            oldtip = oldlen - 1

            if detail and ui.verbose:
                msg = (_('repository tip rolled back to revision %d'
                         ' (undo %s: %s)\n')
                       % (oldtip, desc, detail))
            else:
                msg = (_('repository tip rolled back to revision %d'
                         ' (undo %s)\n')
                       % (oldtip, desc))
        except IOError:
            msg = _('rolling back unknown transaction\n')
            desc = None

        if not force and self['.'] != self['tip'] and desc == 'commit':
            raise error.Abort(
                _('rollback of last commit while not checked out '
                  'may lose data'), hint=_('use -f to force'))

        ui.status(msg)
        if dryrun:
            return 0

        parents = self.dirstate.parents()
        self.destroying()
        vfsmap = {'plain': self.vfs, '': self.svfs}
        transaction.rollback(self.svfs, vfsmap, 'undo', ui.warn,
                             checkambigfiles=_cachedfiles)
        bookmarksvfs = bookmarks.bookmarksvfs(self)
        if bookmarksvfs.exists('undo.bookmarks'):
            bookmarksvfs.rename('undo.bookmarks', 'bookmarks', checkambig=True)
        if self.svfs.exists('undo.phaseroots'):
            self.svfs.rename('undo.phaseroots', 'phaseroots', checkambig=True)

            self.dirstate.restorebackup(None, 'undo.dirstate')
            try:
                branch = self.vfs.read('undo.branch')
                self.dirstate.setbranch(encoding.tolocal(branch))
            except IOError:
                ui.warn(_('named branch could not be reset: '
                          'current branch is still \'%s\'\n')
                        % self.dirstate.branch())

            parents = tuple([p.rev() for p in self[None].parents()])
            if len(parents) > 1:
                ui.status(_('working directory now based on '
                            'revisions %d and %d\n') % parents)
            else:
                ui.status(_('working directory now based on '
                            'revision %d\n') % parents)
            mergemod.mergestate.clean(self, self['.'].node())

        # TODO: if we know which new heads may result from this rollback, pass
        # them to destroy(), which will prevent the branchhead cache from being
        # invalidated.

        this logic. For this purpose, the created transaction is passed to the
        method.
        """
        # we must avoid cyclic reference between repo and transaction.
        reporef = weakref.ref(self)
        def updater(tr):
            repo = reporef()
            repo.updatecaches(tr)
        return updater

    @unfilteredmethod
    def updatecaches(self, tr=None, full=False):
        """warm appropriate caches

        If a transaction is running, invalidation of store is omitted,
        because discarding in-memory changes might cause inconsistency
        (e.g. incomplete fncache causes unintentional failure, but
        redundant one doesn't).
        '''
        unfiltered = self.unfiltered() # all file caches are stored unfiltered
        for k in list(self._filecache.keys()):
            # dirstate is invalidated separately in invalidatedirstate()
            if k == 'dirstate':
                continue
            if (k == 'changelog' and
                self.currenttransaction() and
                self.changelog._delayed):
                # The changelog object may store unwritten revisions. We don't
                # want to lose them.
                # TODO: Solve the problem instead of working around it.
                continue

            k = pycompat.sysstr(k)
            if k == r'dirstate' or k not in self.__dict__:
                continue
            ce.refresh()

    def _lock(self, vfs, lockname, wait, releasefn, acquirefn, desc,
              inheritchecker=None, parentenvvar=None):
        parentlock = None
        # the contents of parentenvvar are used by the underlying lock to
        # determine whether it can be inherited
        if parentenvvar is not None:
            parentlock = encoding.environ.get(parentenvvar)

            timeout = self.ui.configint("ui", "timeout")
            warntimeout = self.ui.configint("ui", "timeout.warn")
        # internal config: ui.signal-safe-lock
        signalsafe = self.ui.configbool('ui', 'signal-safe-lock')

        l = lockmod.trylock(self.ui, vfs, lockname, timeout, warntimeout,
                            releasefn=releasefn,
                            acquirefn=acquirefn, desc=desc,
                            inheritchecker=inheritchecker,
                            parentlock=parentlock,
                            signalsafe=signalsafe)
        return l

    def _afterlock(self, callback):
        """add a callback to be run when the repository is fully unlocked

        for ref in (self._wlockref, self._lockref):
            l = ref and ref()
            if l and l.held:
                l.postrelease.append(callback)
                break
        else: # no lock have been found.
            callback()

    def lock(self, wait=True):
        '''Lock the repository store (.hg/store) and return a weak reference
        to the lock. Use this before modifying the store (e.g. committing or

        l = self._currentlock(self._lockref)
        if l is not None:
            l.lock()
            return l

        l = self._lock(vfs=self.svfs,
                       lockname="lock",
                       wait=wait,
                       releasefn=None,
                       acquirefn=self.invalidate,
                       desc=_('repository %s') % self.origroot)
        self._lockref = weakref.ref(l)
        return l

    def _wlockchecktransaction(self):
        if self.currenttransaction() is not None:
            raise error.LockInheritanceContractViolation(
                'wlock cannot be inherited in the middle of a transaction')

    def wlock(self, wait=True):
        '''Lock the non-store parts of the repository (everything under
        .hg except .hg/store) and return a weak reference to the lock.

            l.lock()
            return l

        # We do not need to check for non-waiting lock acquisition.  Such
        # acquisition would not cause dead-lock as they would just fail.
        if wait and (self.ui.configbool('devel', 'all-warnings')
                     or self.ui.configbool('devel', 'check-locks')):
            if self._currentlock(self._lockref) is not None:
                self.ui.develwarn('"wlock" acquired after "lock"')

        def unlock():
            if self.dirstate.pendingparentchange():

            else:
                self.dirstate.write(None)

            self._filecache['dirstate'].refresh()

        l = self._lock(self.vfs, "wlock", wait, unlock,
                       self.invalidatedirstate, _('working directory of %s') %
                       self.origroot,
                       inheritchecker=self._wlockchecktransaction,
                       parentenvvar='HG_WLOCK_LOCKER')
        self._wlockref = weakref.ref(l)
        return l

    def _currentlock(self, lockref):
        """Returns the lock if it's held, or None if it's not."""

    def currentwlock(self):
        """Returns the wlock if it's held, or None if it's not."""
        return self._currentlock(self._wlockref)

    def _filecommit(self, fctx, manifest1, manifest2, linkrev, tr, changelist,
                    includecopymeta):
        """
        commit an individual file as part of a larger transaction
        """

        fname = fctx.path()

        fparent2 = manifest2.get(fname, nullid)
        if isinstance(fctx, context.filectx):
            node = fctx.filenode()
            if node in [fparent1, fparent2]:
                self.ui.debug('reusing %s filelog entry\n' % fname)
                if ((fparent1 != nullid and
                     manifest1.flags(fname) != fctx.flags()) or
                    (fparent2 != nullid and
                     manifest2.flags(fname) != fctx.flags())):
                    changelist.append(fname)
                return node

        flog = self.file(fname)
        meta = {}

            #

            cnode = manifest1.get(cfname)
            newfparent = fparent2

            if manifest2: # branch merge
                if fparent2 == nullid or cnode is None: # copied on remote side
                    if cfname in manifest2:
                        cnode = manifest2[cfname]
                        newfparent = fparent1

            # Here, we used to search backwards through history to try to find

                if includecopymeta:
                    meta["copy"] = cfname
                    meta["copyrev"] = hex(cnode)
                fparent1, fparent2 = nullid, newfparent
            else:
                self.ui.warn(_("warning: can't find ancestor for '%s' "
                               "copied from '%s'!\n") % (fname, cfname))

        elif fparent1 == nullid:
            fparent1, fparent2 = fparent2, nullid
        elif fparent2 != nullid:
            # is one parent an ancestor of the other?

                f = self.dirstate.normalize(f)
                if f == '.' or f in matched or f in wctx.substate:
                    continue
                if f in status.deleted:
                    fail(f, _('file not found!'))
                if f in vdirs: # visited directory
                    d = f + '/'
                    for mf in matched:
                        if mf.startswith(d):
                            break
                    else:
                        fail(f, _("no match under directory!"))
                elif f not in self.dirstate:
                    fail(f, _("file not tracked!"))

    @unfilteredmethod
    def commit(self, text="", user=None, date=None, match=None, force=False,
               editor=False, extra=None):
        """Add a new revision to current repository.

        Revision information is gathered from the working directory,
        match can be used to filter the committed files. If editor is
        supplied, it is called to get a commit message.

        with self.wlock(), self.lock():
            wctx = self[None]
            merge = len(wctx.parents()) > 1

            if not force and merge and not match.always():
                raise error.Abort(_('cannot partially commit a merge '
                                   '(do not specify files or patterns)'))

            status = self.status(match=match, clean=force)
            if force:
                status.modified.extend(status.clean) # mq may commit clean files

            # check subrepos
            subs, commitsubs, newstate = subrepoutil.precommit(
                self.ui, wctx, status, match, force=force)

            # make sure all explicit patterns are matched
            if not force:
                self.checkcommitpatterns(wctx, vdirs, match, status, fail)

            cctx = context.workingcommitctx(self, status,
                                            text, user, date, extra)

            # internal config: ui.allowemptycommit
            allowemptycommit = (wctx.branch() != wctx.p1().branch()
                                or extra.get('close') or merge or cctx.files()
                                or self.ui.configbool('ui', 'allowemptycommit'))
            if not allowemptycommit:
                return None

            if merge and cctx.deleted():
                raise error.Abort(_("cannot commit merge with missing files"))

            ms = mergemod.mergestate.read(self)
            mergeutil.checkunresolved(ms)

            if editor:
                cctx._text = editor(self, cctx, subs)
            edited = (text != cctx._text)

            # Save commit message in case this transaction gets rolled back
            # (e.g. by a pretxncommit hook).  Leave the content alone on
            # the assumption that the user will use the same editor again.
            msgfn = self.savecommitmessage(cctx._text)

            # commit subs and write new state
            if subs:
                uipathfn = scmutil.getuipathfn(self)
                for s in sorted(commitsubs):
                    sub = wctx.sub(s)
                    self.ui.status(_('committing subrepository %s\n') %
                                   uipathfn(subrepoutil.subrelpath(sub)))
                    sr = sub.commit(cctx._text, user, date)
                    newstate[s] = (newstate[s][0], sr)
                subrepoutil.writestate(self, newstate)

            p1, p2 = self.dirstate.parents()
            hookp1, hookp2 = hex(p1), (p2 != nullid and hex(p2) or '')
            try:
                self.hook("precommit", throw=True, parent1=hookp1,
                          parent2=hookp2)
                with self.transaction('commit'):
                    ret = self.commitctx(cctx, True)
                    # update bookmarks, dirstate and mergestate
                    bookmarks.update(self, [p1, p2], ret)
                    cctx.markcommitted(ret)
                    ms.reset()
            except: # re-raises
                if edited:
                    self.ui.write(
                        _('note: commit message saved in %s\n') % msgfn)
                raise

        def commithook():
            # hack for command that use a temporary commit (eg: histedit)
            # temporary commit got stripped before hook release
            if self.changelog.hasnode(ret):
                self.hook("commit", node=hex(ret), parent1=hookp1,
                          parent2=hookp2)
        self._afterlock(commithook)
        return ret

    @unfilteredmethod
    def commitctx(self, ctx, error=False, origctx=None):

        p1, p2 = ctx.p1(), ctx.p2()
        user = ctx.user()

        writecopiesto = self.ui.config('experimental', 'copies.write-to')
        writefilecopymeta = writecopiesto != 'changeset-only'
        writechangesetcopy = (writecopiesto in
                              ('changeset-only', 'compatibility'))
        p1copies, p2copies = None, None
        if writechangesetcopy:
            p1copies = ctx.p1copies()
            p2copies = ctx.p2copies()
        filesadded, filesremoved = None, None

                        fctx = ctx[f]
                        if fctx is None:
                            removed.append(f)
                        else:
                            added.append(f)
                            m[f] = self._filecommit(fctx, m1, m2, linkrev,
                                                    trp, changed,
                                                    writefilecopymeta)
                            m.setflag(f, fctx.flags())
                    except OSError:
                        self.ui.warn(_("trouble committing %s!\n") %
                                     uipathfn(f))
                        raise
                    except IOError as inst:
                        errcode = getattr(inst, 'errno', errno.ENOENT)
                        if error or errcode and errcode != errno.ENOENT:
                            self.ui.warn(_("trouble committing %s!\n") %
                                         uipathfn(f))
                        raise

                # update manifest
                removed = [f for f in removed if f in m1 or f in m2]
                drop = sorted([f for f in removed if f in m])
                for f in drop:
                    del m[f]
                if p2.rev() != nullrev:
                    @util.cachefunc
                    def mas():
                        p1n = p1.node()
                        p2n = p2.node()
                        cahs = self.changelog.commonancestorsheads(p1n, p2n)
                        if not cahs:
                            cahs = [nullrev]
                        return [self[r].manifest() for r in cahs]
                    def deletionfromparent(f):
                        # When a file is removed relative to p1 in a merge, this
                        # function determines whether the absence is due to a
                        # deletion from a parent, or whether the merge commit
                        # itself deletes the file. We decide this by doing a

                        # described above is not done directly in _filecommit
                        # when creating the list of changed files, however
                        # it does something very similar by comparing filelog
                        # nodes.
                        if f in m1:
                            return (f not in m2
                                    and all(f in ma and ma.find(f) == m1.find(f)
                                            for ma in mas()))
                        elif f in m2:
                            return all(f in ma and ma.find(f) == m2.find(f)
                                       for ma in mas())
                        else:
                            return True
                    removed = [f for f in removed if not deletionfromparent(f)]

                files = changed + removed
                md = None
                if not files:
                    # if no "files" actually changed in terms of the changelog,
                    # try hard to detect unmodified manifest entry so that the
                    # exact same commit can be reproduced later on convert.
                    md = m1.diff(m, scmutil.matchfiles(self, ctx.files()))
                if not files and md:
                    self.ui.debug('not reusing manifest (no file change in '
                                  'changelog, but manifest differs)\n')
                if files or md:
                    self.ui.note(_("committing manifest\n"))
                    # we're using narrowmatch here since it's already applied at
                    # other stages (such as dirstate.walk), so we're already
                    # ignoring things outside of narrowspec in most cases. The
                    # one case where we might have files outside the narrowspec
                    # at this point is merges, and we already error out in the
                    # case where the merge has files outside of the narrowspec,
                    # so this is safe.
                    mn = mctx.write(trp, linkrev,
                                    p1.manifestnode(), p2.manifestnode(),
                                    added, drop, match=self.narrowmatch())

                    if writechangesetcopy:
                        filesadded = [f for f in changed
                                      if not (f in m1 or f in m2)]
                        filesremoved = removed
                else:
                    self.ui.debug('reusing manifest from p1 (listed files '
                                  'actually unchanged)\n')
                    mn = p1.manifestnode()
            else:
                self.ui.debug('reusing manifest from p1 (no file change)\n')
                mn = p1.manifestnode()
                files = []

                files = origctx.files()

            # update changelog
            self.ui.note(_("committing changelog\n"))
            self.changelog.delayupdate(tr)
            n = self.changelog.add(mn, files, ctx.description(),
                                   trp, p1.node(), p2.node(),
                                   user, ctx.date(), ctx.extra().copy(),
                                   p1copies, p2copies, filesadded, filesremoved)
            xp1, xp2 = p1.hex(), p2 and p2.hex() or ''
            self.hook('pretxncommit', throw=True, node=hex(n), parent1=xp1,
                      parent2=xp2)
            # set the new commit is proper phase
            targetphase = subrepoutil.newcommitphase(self.ui, ctx)
            if targetphase:
                # retract boundary do not alter parent changeset.
                # if a parent have higher the resulting phase will

        # head, refresh the tag cache, then immediately add a new head.
        # But I think doing it this way is necessary for the "instant
        # tag cache retrieval" case to work.
        self.invalidate()

    def status(self, node1='.', node2=None, match=None,
               ignored=False, clean=False, unknown=False,
               listsubrepos=False):
        '''a convenience method that calls node1.status(node2)'''
        return self[node1].status(node2, match, ignored, clean, unknown,
                                  listsubrepos)

    def addpostdsstatus(self, ps):
        """Add a callback to run within the wlock, at the point at which status
        fixups happen.

            if exc.hint:
                self.ui.write_err(_("(%s)\n") % exc.hint)
            return False
        self.ui.debug('pushing key for "%s:%s"\n' % (namespace, key))
        ret = pushkey.push(self, namespace, key, old, new)
        def runhook():
            self.hook('pushkey', namespace=namespace, key=key, old=old, new=new,
                      ret=ret)
        self._afterlock(runhook)
        return ret

    def listkeys(self, namespace):
        self.hook('prelistkeys', throw=True, namespace=namespace)

        self.hook('listkeys', namespace=namespace, values=values)
        return values

    def debugwireargs(self, one, two, three=None, four=None, five=None):
        '''used to test argument passing over the wire'''
        return "%s %s %s %s %s" % (one, two, pycompat.bytestr(three),
                                   pycompat.bytestr(four),
                                   pycompat.bytestr(five))

    def savecommitmessage(self, text):
        fp = self.vfs('last-message.txt', 'wb')
        try:
            fp.write(text)
        finally:
            fp.close()
        return self.pathto(fp.name[len(self.root) + 1:])

# used to avoid circular references so destructors work
def aftertrans(files):
    renamefiles = [tuple(t) for t in files]
    def a():
        for vfs, src, dest in renamefiles:
            # if src and dest refer to a same file, vfs.rename is a no-op,
            # leaving both src and dest on disk. delete dest to make sure
            # the rename couldn't be such a no-op.
            vfs.tryunlink(dest)
            try:
                vfs.rename(src, dest)
            except OSError: # journal file does not yet exist
                pass
    return a

def undoname(fn):
    base, name = os.path.split(fn)
    assert name.startswith('journal')
    return os.path.join(base, name.replace('journal', 'undo', 1))

def instance(ui, path, create, intents=None, createopts=None):
    localpath = util.urllocalpath(path)
    if create:
        createrepository(ui, localpath, createopts=createopts)

    return makelocalrepository(ui, localpath, intents=intents)

def islocal(path):
    return True

def defaultcreateopts(ui, createopts=None):
    """Populate the default creation options for a repository.

    A dictionary of explicitly requested creation options can be passed

    if 'backend' not in createopts:
        # experimental config: storage.new-repo-backend
        createopts['backend'] = ui.config('storage', 'new-repo-backend')

    return createopts

def newreporequirements(ui, createopts):
    """Determine the set of requirements for a new local repository.

    Extensions can wrap this function to specify custom requirements for

            requirements.add('shared')

        return requirements

    if 'backend' not in createopts:
        raise error.ProgrammingError('backend key not present in createopts; '
                                     'was defaultcreateopts() called?')

    if createopts['backend'] != 'revlogv1':
        raise error.Abort(_('unable to determine repository requirements for '
                            'storage backend: %s') % createopts['backend'])

    requirements = {'revlogv1'}
    if ui.configbool('format', 'usestore'):
        requirements.add('store')
        if ui.configbool('format', 'usefncache'):

            if ui.configbool('format', 'dotencode'):
                requirements.add('dotencode')

    compengine = ui.config('format', 'revlog-compression')
    if compengine not in util.compengines:
        raise error.Abort(_('compression engine %s defined by '
                            'format.revlog-compression not available') %
                          compengine,
                          hint=_('run "hg debuginstall" to list available '
                                 'compression engines'))

    # zlib is the historical default and doesn't need an explicit requirement.
    elif compengine == 'zstd':
        requirements.add('revlog-compression-zstd')
    elif compengine != 'zlib':

    if ui.configbool('format', 'bookmarks-in-store'):
        requirements.add(bookmarks.BOOKMARKS_IN_STORE_REQUIREMENT)

    return requirements

def filterknowncreateopts(ui, createopts):
    """Filters a dict of repo creation options against options that are known.

    Receives a dict of repo creation options and returns a dict of those

        'shareditems',
        'shallowfilestore',
    }

    return {k: v for k, v in createopts.items() if k not in known}

def createrepository(ui, path, createopts=None):
    """Create a new repository in a vfs.

    ``path`` path to the new repo's working directory.

    createopts = defaultcreateopts(ui, createopts=createopts)

    unknownopts = filterknowncreateopts(ui, createopts)

    if not isinstance(unknownopts, dict):
        raise error.ProgrammingError('filterknowncreateopts() did not return '
                                     'a dict')

    if unknownopts:
        raise error.Abort(_('unable to create repository because of unknown '
                            'creation option: %s') %
                          ', '.join(sorted(unknownopts)),
                          hint=_('is a required extension not loaded?'))

    requirements = newreporequirements(ui, createopts=createopts)

    wdirvfs = vfsmod.vfs(path, expandpath=True, realpath=True)

            try:
                sharedpath = os.path.relpath(sharedpath, hgvfs.base)
            except (IOError, ValueError) as e:
                # ValueError is raised on Windows if the drive letters differ
                # on each path.
                raise error.Abort(_('cannot calculate relative path'),
                                  hint=stringutil.forcebytestr(e))

    if not wdirvfs.exists():
        wdirvfs.makedirs()

    hgvfs.makedir(notindexed=True)

        # effectively locks out old clients and prevents them from
        # mucking with a repo in an unknown format.
        #
        # The revlog header has version 2, which won't be recognized by
        # such old clients.
        hgvfs.append(b'00changelog.i',
                     b'\0\0\0\2 dummy changelog to prevent using the old repo '
                     b'layout')

    scmutil.writerequires(hgvfs, requirements)

    # Write out file telling readers where to find the shared store.
    if 'sharedrepo' in createopts:
        hgvfs.write(b'sharedpath', sharedpath)

    if createopts.get('shareditems'):
        shared = b'\n'.join(sorted(createopts['shareditems'])) + b'\n'
        hgvfs.write(b'shared', shared)

def poisonrepository(repo):
    """Poison a repository instance so it can no longer be used."""
    # Perform any cleanup on the instance.
    repo.close()

    class poisonedrepository(object):
        def __getattribute__(self, item):
            if item == r'close':
                return object.__getattribute__(self, item)

            raise error.ProgrammingError('repo instances should not be used '
                                         'after unshare')

        def close(self):
            pass

    # We may have a repoview, which intercepts __setattr__. So be sure

43076:2372284d9457

from .utils import (
    procutil,
    stringutil,
)

from .revlogutils import constants as revlogconst

release = lockmod.release
urlerr = util.urlerr
urlreq = util.urlreq

# set of (path, vfs-location) tuples. vfs-location is:
# - 'plain for vfs relative paths
# - '' for svfs relative paths
_cachedfiles = set()


class _basefilecache(scmutil.filecache):
    """All filecache usage on repo are done for logic that should be unfiltered
    """

    def __get__(self, repo, type=None):
        if repo is None:
            return self
        # proxy to unfiltered __dict__ since filtered repo has no entry
        unfi = repo.unfiltered()

        return super(_basefilecache, self).__get__(unfi, type)

    def set(self, repo, value):
        return super(_basefilecache, self).set(repo.unfiltered(), value)


class repofilecache(_basefilecache):
    """filecache for files in .hg but outside of .hg/store"""

    def __init__(self, *paths):
        super(repofilecache, self).__init__(*paths)
        for path in paths:
            _cachedfiles.add((path, 'plain'))

    def join(self, obj, fname):
        return obj.vfs.join(fname)


class storecache(_basefilecache):
    """filecache for files in the store"""

    def __init__(self, *paths):
        super(storecache, self).__init__(*paths)
        for path in paths:
            _cachedfiles.add((path, ''))

    def join(self, obj, fname):
        return obj.sjoin(fname)


class mixedrepostorecache(_basefilecache):
    """filecache for a mix files in .hg/store and outside"""

    def __init__(self, *pathsandlocations):
        # scmutil.filecache only uses the path for passing back into our
        # join(), so we can safely pass a list of paths and locations
        super(mixedrepostorecache, self).__init__(*pathsandlocations)
        _cachedfiles.update(pathsandlocations)

        fname, location = fnameandlocation
        if location == 'plain':
            return obj.vfs.join(fname)
        else:
            if location != '':
                raise error.ProgrammingError(
                    'unexpected location: %s' % location
                )
            return obj.sjoin(fname)


def isfilecached(repo, name):
    """check if a repo has already cached "name" filecache-ed property

    This returns (cachedobj-or-None, iscached) tuple.

    cacheentry = repo.unfiltered()._filecache.get(name, None)
    if not cacheentry:
        return None, False
    return cacheentry.obj, True


class unfilteredpropertycache(util.propertycache):
    """propertycache that apply to unfiltered repo only"""

    def __get__(self, repo, type=None):
        unfi = repo.unfiltered()
        if unfi is repo:
            return super(unfilteredpropertycache, self).__get__(unfi)
        return getattr(unfi, self.name)


class filteredpropertycache(util.propertycache):
    """propertycache that must take filtering in account"""

    def cachevalue(self, obj, value):
        object.__setattr__(obj, self.name, value)

def hasunfilteredcache(repo, name):
    """check if a repo has an unfilteredpropertycache value for <name>"""
    return name in vars(repo.unfiltered())


def unfilteredmethod(orig):
    """decorate method that always need to be run on unfiltered version"""

    def wrapper(repo, *args, **kwargs):
        return orig(repo.unfiltered(), *args, **kwargs)

    return wrapper


moderncaps = {
    'lookup',
    'branchmap',
    'pushkey',
    'known',
    'getbundle',
    'unbundle',
}
legacycaps = moderncaps.union({'changegroupsubset'})


@interfaceutil.implementer(repository.ipeercommandexecutor)
class localcommandexecutor(object):
    def __init__(self, peer):
        self._peer = peer

    def __exit__(self, exctype, excvalue, exctb):
        self.close()

    def callcommand(self, command, args):
        if self._sent:
            raise error.ProgrammingError(
                'callcommand() cannot be used after ' 'sendcommands()'
            )

        if self._closed:
            raise error.ProgrammingError(
                'callcommand() cannot be used after ' 'close()'
            )

        # We don't need to support anything fancy. Just call the named
        # method on the peer and return a resolved future.
        fn = getattr(self._peer, pycompat.sysstr(command))

        self._sent = True

    def close(self):
        self._closed = True


@interfaceutil.implementer(repository.ipeercommands)
class localpeer(repository.peer):
    '''peer for a local repo; reflects only the most recent API'''

    def __init__(self, repo, caps=None):

    def clonebundles(self):
        return self._repo.tryread('clonebundles.manifest')

    def debugwireargs(self, one, two, three=None, four=None, five=None):
        """Used to test argument passing over the wire"""
        return "%s %s %s %s %s" % (
            one,
            two,
            pycompat.bytestr(three),
            pycompat.bytestr(four),
            pycompat.bytestr(five),
        )

    def getbundle(
        self, source, heads=None, common=None, bundlecaps=None, **kwargs
    ):
        chunks = exchange.getbundlechunks(
            self._repo,
            source,
            heads=heads,
            common=common,
            bundlecaps=bundlecaps,
            **kwargs
        )[1]
        cb = util.chunkbuffer(chunks)

        if exchange.bundle2requested(bundlecaps):
            # When requesting a bundle2, getbundle returns a stream to make the
            # wire level function happier. We need to build a proper object

    def pushkey(self, namespace, key, old, new):
        return self._repo.pushkey(namespace, key, old, new)

    def stream_out(self):
        raise error.Abort(
            _('cannot perform stream clone against local ' 'peer')
        )

    def unbundle(self, bundle, heads, url):
        """apply a bundle on a repo

        This function handles the repo locking itself."""

                    stream = util.chunkbuffer(bundler.getchunks())
                    b = bundle2.getunbundler(self.ui, stream)
                    bundle2.processbundle(self._repo, b)
                raise
        except error.PushRaced as exc:
            raise error.ResponseError(
                _('push failed:'), stringutil.forcebytestr(exc)
            )

    # End of _basewirecommands interface.

    # Begin of peer interface.

    def commandexecutor(self):
        return localcommandexecutor(self)

    # End of peer interface.


@interfaceutil.implementer(repository.ipeerlegacycommands)
class locallegacypeer(localpeer):
    '''peer extension which implements legacy methods too; used for tests with
    restricted capabilities'''

    def branches(self, nodes):
        return self._repo.branches(nodes)

    def changegroup(self, nodes, source):
        outgoing = discovery.outgoing(
            self._repo, missingroots=nodes, missingheads=self._repo.heads()
        )
        return changegroup.makechangegroup(self._repo, outgoing, '01', source)

    def changegroupsubset(self, bases, heads, source):
        outgoing = discovery.outgoing(
            self._repo, missingroots=bases, missingheads=heads
        )
        return changegroup.makechangegroup(self._repo, outgoing, '01', source)

    # End of baselegacywirecommands interface.


# Increment the sub-version when the revlog v2 format changes to lock out old
# clients.
REVLOGV2_REQUIREMENT = 'exp-revlogv2.1'

#
# The function receives a set of requirement strings that the repository
# is capable of opening. Functions will typically add elements to the
# set to reflect that the extension knows how to handle that requirements.
featuresetupfuncs = set()


def makelocalrepository(baseui, path, intents=None):
    """Create a local repository object.

    Given arguments needed to construct a local repository, this function

            sharedpath = hgvfs.join(sharedpath)

        sharedvfs = vfsmod.vfs(sharedpath, realpath=True)

        if not sharedvfs.exists():
            raise error.RepoError(
                _(b'.hg/sharedpath points to nonexistent ' b'directory %s')
                % sharedvfs.base
            )

        features.add(repository.REPO_FEATURE_SHARED_STORAGE)

        storebasepath = sharedvfs.base
        cachepath = sharedvfs.join(b'cache')
    else:
        storebasepath = hgvfs.base
        cachepath = hgvfs.join(b'cache')
    wcachepath = hgvfs.join(b'wcache')

    # The store has changed over time and the exact layout is dictated by
    # requirements. The store interface abstracts differences across all
    # of them.
    store = makestore(
        requirements,
        storebasepath,
        lambda base: vfsmod.vfs(base, cacheaudited=True),
    )
    hgvfs.createmode = store.createmode

    storevfs = store.vfs
    storevfs.options = resolvestorevfsoptions(ui, requirements, features)

    extrastate = {}

    for iface, fn in REPO_INTERFACES:
        # We pass all potentially useful state to give extensions tons of
        # flexibility.
        typ = fn()(
            ui=ui,
            intents=intents,
            requirements=requirements,
            features=features,
            wdirvfs=wdirvfs,
            hgvfs=hgvfs,
            store=store,
            storevfs=storevfs,
            storeoptions=storevfs.options,
            cachevfs=cachevfs,
            wcachevfs=wcachevfs,
            extensionmodulenames=extensionmodulenames,
            extrastate=extrastate,
            baseclasses=bases,
        )

        if not isinstance(typ, type):
            raise error.ProgrammingError(
                'unable to construct type for %s' % iface
            )

        bases.append(typ)

    # type() allows you to use characters in type names that wouldn't be
    # recognized as Python symbols in source code. We abuse that to add
    # rich information about our constructed repo.
    name = pycompat.sysstr(
        b'derivedrepo:%s<%s>' % (wdirvfs.base, b','.join(sorted(requirements)))
    )

    cls = type(name, tuple(bases), {})

    return cls(
        baseui=baseui,

        sharedpath=storebasepath,
        store=store,
        cachevfs=cachevfs,
        wcachevfs=wcachevfs,
        features=features,
        intents=intents,
    )


def loadhgrc(ui, wdirvfs, hgvfs, requirements):
    """Load hgrc files/content into a ui instance.

    This is called during repository opening to load any additional

        ui.readconfig(hgvfs.join(b'hgrc'), root=wdirvfs.base)
        return True
    except IOError:
        return False


def afterhgrcload(ui, wdirvfs, hgvfs, requirements):
    """Perform additional actions after .hg/hgrc is loaded.

    This function is called during repository loading immediately after
    the .hg/hgrc file is loaded and before per-repo extensions are loaded.

            continue

        for name in names:
            if not ui.hasconfig(b'extensions', name):
                ui.setconfig(b'extensions', name, b'', source='autoload')


def gathersupportedrequirements(ui):
    """Determine the complete set of recognized requirements."""
    # Start with all requirements supported by this file.
    supported = set(localrepository._basesupported)

            if engine.name() == 'zstd':
                supported.add(b'revlog-compression-zstd')

    return supported


def ensurerequirementsrecognized(requirements, supported):
    """Validate that a set of local requirements is recognized.

    Receives a set of requirements. Raises an ``error.RepoError`` if there
    exists any requirement in that set that currently loaded code doesn't

        missing.add(requirement)

    if missing:
        raise error.RequirementError(
            _(b'repository requires features unknown to this Mercurial: %s')
            % b' '.join(sorted(missing)),
            hint=_(
                b'see https://mercurial-scm.org/wiki/MissingRequirement '
                b'for more information'
            ),
        )


def ensurerequirementscompatible(ui, requirements):
    """Validates that a set of recognized requirements is mutually compatible.

    Some requirements may not be compatible with others or require

    checking.

    ``error.RepoError`` should be raised on failure.
    """
    if b'exp-sparse' in requirements and not sparse.enabled:
        raise error.RepoError(
            _(
                b'repository is using sparse feature but '
                b'sparse is not enabled; enable the '
                b'"sparse" extensions to access'
            )
        )


def makestore(requirements, path, vfstype):
    """Construct a storage object for a repository."""
    if b'store' in requirements:
        if b'fncache' in requirements:
            return storemod.fncachestore(
                path, vfstype, b'dotencode' in requirements
            )

        return storemod.encodedstore(path, vfstype)

    return storemod.basicstore(path, vfstype)


def resolvestorevfsoptions(ui, requirements, features):
    """Resolve the options to pass to the store vfs opener.

    The returned dict is used to influence behavior of the storage layer.

    # This revlog format is super old and we don't bother trying to parse
    # opener options for it because those options wouldn't do anything
    # meaningful on such old repos.
    if b'revlogv1' in requirements or REVLOGV2_REQUIREMENT in requirements:
        options.update(resolverevlogstorevfsoptions(ui, requirements, features))
    else:  # explicitly mark repo as using revlogv0
        options['revlogv0'] = True

    writecopiesto = ui.config('experimental', 'copies.write-to')
    copiesextramode = ('changeset-only', 'compatibility')
    if writecopiesto in copiesextramode:
        options['copies-storage'] = 'extra'

    return options


def resolverevlogstorevfsoptions(ui, requirements, features):
    """Resolve opener options specific to revlogs."""

    options = {}

    # experimental config: format.chunkcachesize
    chunkcachesize = ui.configint(b'format', b'chunkcachesize')
    if chunkcachesize is not None:
        options[b'chunkcachesize'] = chunkcachesize

    deltabothparents = ui.configbool(
        b'storage', b'revlog.optimize-delta-parent-choice'
    )
    options[b'deltabothparents'] = deltabothparents

    lazydelta = ui.configbool(b'storage', b'revlog.reuse-external-delta')
    lazydeltabase = False
    if lazydelta:
        lazydeltabase = ui.configbool(
            b'storage', b'revlog.reuse-external-delta-parent'
        )
    if lazydeltabase is None:
        lazydeltabase = not scmutil.gddeltaconfig(ui)
    options[b'lazydelta'] = lazydelta
    options[b'lazydeltabase'] = lazydeltabase

    chainspan = ui.configbytes(b'experimental', b'maxdeltachainspan')
    if 0 <= chainspan:
        options[b'maxdeltachainspan'] = chainspan

    mmapindexthreshold = ui.configbytes(b'experimental', b'mmapindexthreshold')
    if mmapindexthreshold is not None:
        options[b'mmapindexthreshold'] = mmapindexthreshold

    withsparseread = ui.configbool(b'experimental', b'sparse-read')
    srdensitythres = float(
        ui.config(b'experimental', b'sparse-read.density-threshold')
    )
    srmingapsize = ui.configbytes(b'experimental', b'sparse-read.min-gap-size')
    options[b'with-sparse-read'] = withsparseread
    options[b'sparse-read-density-threshold'] = srdensitythres
    options[b'sparse-read-min-gap-size'] = srmingapsize

    sparserevlog = SPARSEREVLOG_REQUIREMENT in requirements

    if repository.NARROW_REQUIREMENT in requirements:
        options[b'enableellipsis'] = True

    return options


def makemain(**kwargs):
    """Produce a type conforming to ``ilocalrepositorymain``."""
    return localrepository


@interfaceutil.implementer(repository.ilocalrepositoryfilestorage)
class revlogfilestorage(object):
    """File storage when using revlogs."""

    def file(self, path):
        if path[0] == b'/':
            path = path[1:]

        return filelog.filelog(self.svfs, path)


@interfaceutil.implementer(repository.ilocalrepositoryfilestorage)
class revlognarrowfilestorage(object):
    """File storage when using revlogs and narrow files."""

    def file(self, path):
        if path[0] == b'/':
            path = path[1:]

        return filelog.narrowfilelog(self.svfs, path, self._storenarrowmatch)


def makefilestorage(requirements, features, **kwargs):
    """Produce a type conforming to ``ilocalrepositoryfilestorage``."""
    features.add(repository.REPO_FEATURE_REVLOG_FILE_STORAGE)
    features.add(repository.REPO_FEATURE_STREAM_CLONE)

    if repository.NARROW_REQUIREMENT in requirements:
        return revlognarrowfilestorage
    else:
        return revlogfilestorage


# List of repository interfaces and factory functions for them. Each
# will be called in order during ``makelocalrepository()`` to iteratively
# derive the final type for a local repository instance. We capture the
# function as a lambda so we don't hold a reference and the module-level
# functions can be wrapped.
REPO_INTERFACES = [
    (repository.ilocalrepositorymain, lambda: makemain),
    (repository.ilocalrepositoryfilestorage, lambda: makefilestorage),
]


@interfaceutil.implementer(repository.ilocalrepositorymain)
class localrepository(object):
    """Main class for representing local repositories.

        'fncache',
        'shared',
        'relshared',
        'dotencode',
        'exp-sparse',
        'internal-phase',
    }

    # list of prefix for file which can be written without 'wlock'
    # Extensions should extend this list when needed
    _wlockfreeprefix = {

        # this changeset was introduced. Someone should fix
        # the remainig bit and drop this line
        'bisect.state',
    }

    def __init__(
        self,
        baseui,
        ui,
        origroot,
        wdirvfs,
        hgvfs,
        requirements,
        supportedrequirements,
        sharedpath,
        store,
        cachevfs,
        wcachevfs,
        features,
        intents=None,
    ):
        """Create a new local repository instance.

        Most callers should use ``hg.repository()``, ``localrepo.instance()``,
        or ``localrepo.makelocalrepository()`` for obtaining a new repository
        object.

        self.wcachevfs = wcachevfs
        self.features = features

        self.filtername = None

        if self.ui.configbool('devel', 'all-warnings') or self.ui.configbool(
            'devel', 'check-locks'
        ):
            self.vfs.audit = self._getvfsward(self.vfs.audit)
        # A list of callback to shape the phase if no data were found.
        # Callback are in the form: func(repo, roots) --> processed root.
        # This list it to be filled by extension during repo setup
        self._phasedefaults = []

        color.setup(self.ui)

        self.spath = self.store.path
        self.svfs = self.store.vfs
        self.sjoin = self.store.join
        if self.ui.configbool('devel', 'all-warnings') or self.ui.configbool(
            'devel', 'check-locks'
        ):
            if util.safehasattr(self.svfs, 'vfs'):  # this is filtervfs
                self.svfs.vfs.audit = self._getsvfsward(self.svfs.vfs.audit)
            else:  # standard vfs
                self.svfs.audit = self._getsvfsward(self.svfs.audit)

        self._dirstatevalidatewarned = False

        self._branchcaches = branchmap.BranchMapCache()

        self._extrafilterid = repoview.extrafilter(ui)

    def _getvfsward(self, origfunc):
        """build a ward for self.vfs"""
        rref = weakref.ref(self)

        def checkvfs(path, mode=None):
            ret = origfunc(path, mode=mode)
            repo = rref()
            if (
                repo is None
                or not util.safehasattr(repo, '_wlockref')
                or not util.safehasattr(repo, '_lockref')
            ):
                return
            if mode in (None, 'r', 'rb'):
                return
            if path.startswith(repo.path):
                # truncate name relative to the repository (.hg)
                path = path[len(repo.path) + 1 :]
            if path.startswith('cache/'):
                msg = 'accessing cache with vfs instead of cachevfs: "%s"'
                repo.ui.develwarn(msg % path, stacklevel=3, config="cache-vfs")
            if path.startswith('journal.') or path.startswith('undo.'):
                # journal is covered by 'lock'
                if repo._currentlock(repo._lockref) is None:
                    repo.ui.develwarn(
                        'write with no lock: "%s"' % path,
                        stacklevel=3,
                        config='check-locks',
                    )
            elif repo._currentlock(repo._wlockref) is None:
                # rest of vfs files are covered by 'wlock'
                #
                # exclude special files
                for prefix in self._wlockfreeprefix:
                    if path.startswith(prefix):
                        return
                repo.ui.develwarn(
                    'write with no wlock: "%s"' % path,
                    stacklevel=3,
                    config='check-locks',
                )
            return ret

        return checkvfs

    def _getsvfsward(self, origfunc):
        """build a ward for self.svfs"""
        rref = weakref.ref(self)

        def checksvfs(path, mode=None):
            ret = origfunc(path, mode=mode)
            repo = rref()
            if repo is None or not util.safehasattr(repo, '_lockref'):
                return
            if mode in (None, 'r', 'rb'):
                return
            if path.startswith(repo.sharedpath):
                # truncate name relative to the repository (.hg)
                path = path[len(repo.sharedpath) + 1 :]
            if repo._currentlock(repo._lockref) is None:
                repo.ui.develwarn(
                    'write with no lock: "%s"' % path, stacklevel=4
                )
            return ret

        return checksvfs

    def close(self):
        self._writecaches()

            self._revbranchcache.write()

    def _restrictcapabilities(self, caps):
        if self.ui.configbool('experimental', 'bundle2-advertise'):
            caps = set(caps)
            capsblob = bundle2.encodecaps(
                bundle2.getrepocaps(self, role='client')
            )
            caps.add('bundle2=' + urlreq.quote(capsblob))
        return caps

    def _writerequirements(self):
        scmutil.writerequires(self.vfs, self.requirements)

    @property
    def nofsauditor(self):
        # This is only used by context.basectx.match in order to detect
        # files in subrepos.
        return pathutil.pathauditor(
            self.root, callback=self._checknested, realfs=False, cached=True
        )

    def _checknested(self, path):
        """Determine if path is a legal nested repository."""
        if not path.startswith(self.root):
            return False
        subpath = path[len(self.root) + 1 :]
        normsubpath = util.pconvert(subpath)

        # XXX: Checking against the current working copy is wrong in
        # the sense that it can reject things like
        #

            if prefix in ctx.substate:
                if prefix == normsubpath:
                    return True
                else:
                    sub = ctx.sub(prefix)
                    return sub.checknested(subpath[len(prefix) + 1 :])
            else:
                parts.pop()
        return False

    def peer(self):
        return localpeer(self)  # not cached to avoid reference cycle

    def unfiltered(self):
        """Return unfiltered version of the repository

        Intended to be overwritten by filtered repo."""

        the "served" view, regardless of the initial view used by `repo`.

        In other word, there is always only one level of `repoview` "filtering".
        """
        if self._extrafilterid is not None and '%' not in name:
            name = name + '%' + self._extrafilterid

        cls = repoview.newtype(self.unfiltered().__class__)
        return cls(self, name, visibilityexceptions)

    @mixedrepostorecache(
        ('bookmarks', 'plain'),
        ('bookmarks.current', 'plain'),
        ('bookmarks', ''),
        ('00changelog.i', ''),
    )
    def _bookmarks(self):
        # Since the multiple files involved in the transaction cannot be
        # written atomically (with current repository format), there is a race
        # condition here.
        #

        self._refreshchangelog()
        return bookmarks.bmstore(self)

    def _refreshchangelog(self):
        """make sure the in memory changelog match the on-disk one"""
        if 'changelog' in vars(self) and self.currenttransaction() is None:
            del self.changelog

    @property
    def _activebookmark(self):
        return self._bookmarks.active

    def _makedirstate(self):
        """Extension point for wrapping the dirstate per-repo."""
        sparsematchfn = lambda: sparse.matcher(self)

        return dirstate.dirstate(
            self.vfs, self.ui, self.root, self._dirstatevalidate, sparsematchfn
        )

    def _dirstatevalidate(self, node):
        try:
            self.changelog.rev(node)
            return node
        except error.LookupError:
            if not self._dirstatevalidatewarned:
                self._dirstatevalidatewarned = True
                self.ui.warn(
                    _("warning: ignoring unknown" " working parent %s!\n")
                    % short(node)
                )
            return nullid

    @storecache(narrowspec.FILENAME)
    def narrowpats(self):
        """matcher patterns for this repository's narrowspec

            return context.workingctx(self)
        if isinstance(changeid, context.basectx):
            return changeid
        if isinstance(changeid, slice):
            # wdirrev isn't contiguous so the slice shouldn't include it
            return [
                self[i]
                for i in pycompat.xrange(*changeid.indices(len(self)))
                if i not in self.changelog.filteredrevs
            ]
        try:
            if isinstance(changeid, int):
                node = self.changelog.node(changeid)
                rev = changeid
            elif changeid == 'null':

            elif len(changeid) == 20:
                try:
                    node = changeid
                    rev = self.changelog.rev(changeid)
                except error.FilteredLookupError:
                    changeid = hex(changeid)  # for the error message
                    raise
                except LookupError:
                    # check if it might have come from damaged dirstate
                    #
                    # XXX we could avoid the unfiltered if we had a recognizable
                    # exception for filtered changeset access
                    if (
                        self.local()
                        and changeid in self.unfiltered().dirstate.parents()
                    ):
                        msg = _("working directory has unknown parent '%s'!")
                        raise error.Abort(msg % short(changeid))
                    changeid = hex(changeid)  # for the error message
                    raise

            elif len(changeid) == 40:
                node = bin(changeid)
                rev = self.changelog.rev(node)
            else:
                raise error.ProgrammingError(
                    "unsupported changeid '%s' of type %s"
                    % (changeid, type(changeid))
                )

            return context.changectx(self, rev, node)

        except (error.FilteredIndexError, error.FilteredLookupError):
            raise error.FilteredRepoLookupError(
                _("filtered revision '%s'") % pycompat.bytestr(changeid)
            )
        except (IndexError, LookupError):
            raise error.RepoLookupError(
                _("unknown revision '%s'") % pycompat.bytestr(changeid)
            )
        except error.WdirUnsupported:
            return context.workingctx(self)

    def __contains__(self, changeid):
        """True if the given changeid exists

        expand user aliases, specify ``user=True``. To provide some local
        definitions overriding user aliases, set ``localalias`` to
        ``{name: definitionstring}``.
        '''
        if user:
            m = revset.matchany(
                self.ui,
                specs,
                lookup=revset.lookupfn(self),
                localalias=localalias,
            )
        else:
            m = revset.matchany(None, specs, localalias=localalias)
        return m(self)

    def url(self):

        # mq and bookmarks add tags, but do not set the tagtype at all.
        # Should each extension invent its own tag type?  Should there
        # be one tagtype for all such "virtual" tags?  Or is the status
        # quo fine?

        # map tag name to (node, hist)
        alltags = tagsmod.findglobaltags(self.ui, self)
        # map tag name to tag type
        tagtypes = dict((tag, 'global') for tag in alltags)

        tags = {}
        for (name, (node, hist)) in alltags.iteritems():
            if node != nullid:
                tags[encoding.tolocal(name)] = node
        tags['tip'] = self.changelog.tip()
        tagtypes = dict(
            [
                (encoding.tolocal(name), value)
                for (name, value) in tagtypes.iteritems()
            ]
        )
        return (tags, tagtypes)

    def tagtype(self, tagname):
        '''
        return the type of the given tag. result can be:

                        self.dirstate.copy(None, f)

    def filectx(self, path, changeid=None, fileid=None, changectx=None):
        """changeid must be a changeset revision, if specified.
           fileid can be a file revision or node."""
        return context.filectx(
            self, path, changeid, fileid, changectx=changectx
        )

    def getcwd(self):
        return self.dirstate.getcwd()

    def pathto(self, f, cwd=None):

                fn = None
                params = cmd
                for name, filterfn in self._datafilters.iteritems():
                    if cmd.startswith(name):
                        fn = filterfn
                        params = cmd[len(name) :].lstrip()
                        break
                if not fn:
                    fn = lambda s, c, **kwargs: procutil.filter(s, c)
                # Wrap old filters not supporting keyword arguments
                if not pycompat.getargspec(fn)[2]:

        """
        data = self._filter(self._decodefilterpats, filename, data)
        if 'l' in flags:
            self.wvfs.symlink(data, filename)
        else:
            self.wvfs.write(
                filename, data, backgroundclose=backgroundclose, **kwargs
            )
            if 'x' in flags:
                self.wvfs.setflags(filename, False, True)
            else:
                self.wvfs.setflags(filename, False, False)
        return len(data)

        if tr and tr.running():
            return tr
        return None

    def transaction(self, desc, report=None):
        if self.ui.configbool('devel', 'all-warnings') or self.ui.configbool(
            'devel', 'check-locks'
        ):
            if self._currentlock(self._lockref) is None:
                raise error.ProgrammingError('transaction requires locking')
        tr = self.currenttransaction()
        if tr is not None:
            return tr.nest(name=desc)

        # abort here if the journal already exists
        if self.svfs.exists("journal"):
            raise error.RepoError(
                _("abandoned transaction found"),
                hint=_("run 'hg recover' to clean up transaction"),
            )

        idbase = "%.40f#%f" % (random.random(), time.time())
        ha = hex(hashlib.sha1(idbase).digest())
        txnid = 'TXN:' + ha
        self.hook('pretxnopen', throw=True, txnname=desc, txnid=txnid)

        renames = [(vfs, x, undoname(x)) for vfs, x in self._journalfiles()]
        if report:
            rp = report
        else:
            rp = self.ui.warn
        vfsmap = {'plain': self.vfs, 'store': self.svfs}  # root of .hg/
        # we must avoid cyclic reference between repo and transaction.
        reporef = weakref.ref(self)
        # Code to track tag movement
        #
        # Since tags are all handled as file content, it is actually quite hard

        tracktags = lambda x: None
        # experimental config: experimental.hook-track-tags
        shouldtracktags = self.ui.configbool('experimental', 'hook-track-tags')
        if desc != 'strip' and shouldtracktags:
            oldheads = self.changelog.headrevs()

            def tracktags(tr2):
                repo = reporef()
                oldfnodes = tagsmod.fnoderevs(repo.ui, repo, oldheads)
                newheads = repo.changelog.headrevs()
                newfnodes = tagsmod.fnoderevs(repo.ui, repo, newheads)
                # notes: we compare lists here.
                # As we do it only once buiding set would not be cheaper
                changes = tagsmod.difftags(repo.ui, repo, oldfnodes, newfnodes)
                if changes:
                    tr2.hookargs['tag_moved'] = '1'
                    with repo.vfs(
                        'changes/tags.changes', 'w', atomictemp=True
                    ) as changesfile:
                        # note: we do not register the file to the transaction
                        # because we needs it to still exist on the transaction
                        # is close (for txnclose hooks)
                        tagsmod.writediff(changesfile, changes)

        def validate(tr2):
            """will run pre-closing hooks"""
            # XXX the transaction API is a bit lacking here so we take a hacky
            # path for now
            #

            # This will have to be fixed before we remove the experimental
            # gating.
            tracktags(tr2)
            repo = reporef()

            r = repo.ui.configsuboptions(
                'experimental', 'single-head-per-branch'
            )
            singlehead, singleheadsub = r
            if singlehead:
                accountclosed = singleheadsub.get("account-closed-heads", False)
                scmutil.enforcesinglehead(repo, tr2, desc, accountclosed)
            if hook.hashook(repo.ui, 'pretxnclose-bookmark'):
                for name, (old, new) in sorted(tr.changes['bookmarks'].items()):
                    args = tr.hookargs.copy()
                    args.update(bookmarks.preparehookargs(name, old, new))
                    repo.hook(
                        'pretxnclose-bookmark',
                        throw=True,
                        **pycompat.strkwargs(args)
                    )
            if hook.hashook(repo.ui, 'pretxnclose-phase'):
                cl = repo.unfiltered().changelog
                for rev, (old, new) in tr.changes['phases'].items():
                    args = tr.hookargs.copy()
                    node = hex(cl.node(rev))
                    args.update(phases.preparehookargs(node, old, new))
                    repo.hook(
                        'pretxnclose-phase',
                        throw=True,
                        **pycompat.strkwargs(args)
                    )

            repo.hook(
                'pretxnclose', throw=True, **pycompat.strkwargs(tr.hookargs)
            )

        def releasefn(tr, success):
            repo = reporef()
            if repo is None:
                # If the repo has been GC'd (and this release function is being
                # called from transaction.__del__), there's not much we can do,

                narrowspec.restorewcbackup(self, 'journal.narrowspec.dirstate')
                repo.dirstate.restorebackup(None, 'journal.dirstate')

                repo.invalidate(clearfilecache=True)

        tr = transaction.transaction(
            rp,
            self.svfs,
            vfsmap,
            "journal",
            "undo",
            aftertrans(renames),
            self.store.createmode,
            validator=validate,
            releasefn=releasefn,
            checkambigfiles=_cachedfiles,
            name=desc,
        )
        tr.changes['origrepolen'] = len(self)
        tr.changes['obsmarkers'] = set()
        tr.changes['phases'] = {}
        tr.changes['bookmarks'] = {}

        tr.hookargs['txnname'] = desc
        # note: writing the fncache only during finalize mean that the file is
        # outdated when running hooks. As fncache is used for streaming clone,
        # this is not expected to break anything that happen during the hooks.
        tr.addfinalize('flush-fncache', self.store.write)

        def txnclosehook(tr2):
            """To be run if transaction is successful, will schedule a hook run
            """
            # Don't reference tr2 in hook() so we don't hold a reference.
            # This reduces memory consumption when there are multiple

                if hook.hashook(repo.ui, 'txnclose-bookmark'):
                    bmchanges = sorted(tr.changes['bookmarks'].items())
                    for name, (old, new) in bmchanges:
                        args = tr.hookargs.copy()
                        args.update(bookmarks.preparehookargs(name, old, new))
                        repo.hook(
                            'txnclose-bookmark',
                            throw=False,
                            **pycompat.strkwargs(args)
                        )

                if hook.hashook(repo.ui, 'txnclose-phase'):
                    cl = repo.unfiltered().changelog
                    phasemv = sorted(tr.changes['phases'].items())
                    for rev, (old, new) in phasemv:
                        args = tr.hookargs.copy()
                        node = hex(cl.node(rev))
                        args.update(phases.preparehookargs(node, old, new))
                        repo.hook(
                            'txnclose-phase',
                            throw=False,
                            **pycompat.strkwargs(args)
                        )

                repo.hook(
                    'txnclose', throw=False, **pycompat.strkwargs(hookargs)
                )

            reporef()._afterlock(hookfunc)

        tr.addfinalize('txnclose-hook', txnclosehook)
        # Include a leading "-" to make it happen before the transaction summary
        # reports registered via scmutil.registersummarycallback() whose names
        # are 00-txnreport etc. That way, the caches will be warm when the
        # callbacks run.
        tr.addpostclose('-warm-cache', self._buildcacheupdater(tr))

        def txnaborthook(tr2):
            """To be run if transaction is aborted
            """
            reporef().hook(
                'txnabort', throw=False, **pycompat.strkwargs(tr2.hookargs)
            )

        tr.addabort('txnabort-hook', txnaborthook)
        # avoid eager cache invalidation. in-memory data should be identical
        # to stored data if transaction has no error.
        tr.addpostclose('refresh-filecachestats', self._refreshfilecachestats)
        self._transref = weakref.ref(tr)
        scmutil.registersummarycallback(self, tr, desc)
        return tr

    def _journalfiles(self):
        return (
            (self.svfs, 'journal'),
            (self.svfs, 'journal.narrowspec'),
            (self.vfs, 'journal.narrowspec.dirstate'),
            (self.vfs, 'journal.dirstate'),
            (self.vfs, 'journal.branch'),
            (self.vfs, 'journal.desc'),
            (bookmarks.bookmarksvfs(self), 'journal.bookmarks'),
            (self.svfs, 'journal.phaseroots'),
        )

    def undofiles(self):
        return [(vfs, undoname(x)) for vfs, x in self._journalfiles()]

    @unfilteredmethod
    def _writejournal(self, desc):
        self.dirstate.savebackup(None, 'journal.dirstate')
        narrowspec.savewcbackup(self, 'journal.narrowspec.dirstate')
        narrowspec.savebackup(self, 'journal.narrowspec')
        self.vfs.write(
            "journal.branch", encoding.fromlocal(self.dirstate.branch())
        )
        self.vfs.write("journal.desc", "%d\n%s\n" % (len(self), desc))
        bookmarksvfs = bookmarks.bookmarksvfs(self)
        bookmarksvfs.write(
            "journal.bookmarks", bookmarksvfs.tryread("bookmarks")
        )
        self.svfs.write("journal.phaseroots", self.svfs.tryread("phaseroots"))

    def recover(self):
        with self.lock():
            if self.svfs.exists("journal"):
                self.ui.status(_("rolling back interrupted transaction\n"))
                vfsmap = {
                    '': self.svfs,
                    'plain': self.vfs,
                }
                transaction.rollback(
                    self.svfs,
                    vfsmap,
                    "journal",
                    self.ui.warn,
                    checkambigfiles=_cachedfiles,
                )
                self.invalidate()
                return True
            else:
                self.ui.warn(_("no interrupted transaction available\n"))
                return False

                self.ui.warn(_("no rollback information available\n"))
                return 1
        finally:
            release(dsguard, lock, wlock)

    @unfilteredmethod  # Until we get smarter cache management
    def _rollback(self, dryrun, force, dsguard):
        ui = self.ui
        try:
            args = self.vfs.read('undo.desc').splitlines()
            (oldlen, desc, detail) = (int(args[0]), args[1], None)
            if len(args) >= 3:
                detail = args[2]
            oldtip = oldlen - 1

            if detail and ui.verbose:
                msg = _(
                    'repository tip rolled back to revision %d'
                    ' (undo %s: %s)\n'
                ) % (oldtip, desc, detail)
            else:
                msg = _(
                    'repository tip rolled back to revision %d' ' (undo %s)\n'
                ) % (oldtip, desc)
        except IOError:
            msg = _('rolling back unknown transaction\n')
            desc = None

        if not force and self['.'] != self['tip'] and desc == 'commit':
            raise error.Abort(
                _(
                    'rollback of last commit while not checked out '
                    'may lose data'
                ),
                hint=_('use -f to force'),
            )

        ui.status(msg)
        if dryrun:
            return 0

        parents = self.dirstate.parents()
        self.destroying()
        vfsmap = {'plain': self.vfs, '': self.svfs}
        transaction.rollback(
            self.svfs, vfsmap, 'undo', ui.warn, checkambigfiles=_cachedfiles
        )
        bookmarksvfs = bookmarks.bookmarksvfs(self)
        if bookmarksvfs.exists('undo.bookmarks'):
            bookmarksvfs.rename('undo.bookmarks', 'bookmarks', checkambig=True)
        if self.svfs.exists('undo.phaseroots'):
            self.svfs.rename('undo.phaseroots', 'phaseroots', checkambig=True)

            self.dirstate.restorebackup(None, 'undo.dirstate')
            try:
                branch = self.vfs.read('undo.branch')
                self.dirstate.setbranch(encoding.tolocal(branch))
            except IOError:
                ui.warn(
                    _(
                        'named branch could not be reset: '
                        'current branch is still \'%s\'\n'
                    )
                    % self.dirstate.branch()
                )

            parents = tuple([p.rev() for p in self[None].parents()])
            if len(parents) > 1:
                ui.status(
                    _('working directory now based on ' 'revisions %d and %d\n')
                    % parents
                )
            else:
                ui.status(
                    _('working directory now based on ' 'revision %d\n')
                    % parents
                )
            mergemod.mergestate.clean(self, self['.'].node())

        # TODO: if we know which new heads may result from this rollback, pass
        # them to destroy(), which will prevent the branchhead cache from being
        # invalidated.

        this logic. For this purpose, the created transaction is passed to the
        method.
        """
        # we must avoid cyclic reference between repo and transaction.
        reporef = weakref.ref(self)

        def updater(tr):
            repo = reporef()
            repo.updatecaches(tr)

        return updater

    @unfilteredmethod
    def updatecaches(self, tr=None, full=False):
        """warm appropriate caches

        If a transaction is running, invalidation of store is omitted,
        because discarding in-memory changes might cause inconsistency
        (e.g. incomplete fncache causes unintentional failure, but
        redundant one doesn't).
        '''
        unfiltered = self.unfiltered()  # all file caches are stored unfiltered
        for k in list(self._filecache.keys()):
            # dirstate is invalidated separately in invalidatedirstate()
            if k == 'dirstate':
                continue
            if (
                k == 'changelog'
                and self.currenttransaction()
                and self.changelog._delayed
            ):
                # The changelog object may store unwritten revisions. We don't
                # want to lose them.
                # TODO: Solve the problem instead of working around it.
                continue

            k = pycompat.sysstr(k)
            if k == r'dirstate' or k not in self.__dict__:
                continue
            ce.refresh()

    def _lock(
        self,
        vfs,
        lockname,
        wait,
        releasefn,
        acquirefn,
        desc,
        inheritchecker=None,
        parentenvvar=None,
    ):
        parentlock = None
        # the contents of parentenvvar are used by the underlying lock to
        # determine whether it can be inherited
        if parentenvvar is not None:
            parentlock = encoding.environ.get(parentenvvar)

            timeout = self.ui.configint("ui", "timeout")
            warntimeout = self.ui.configint("ui", "timeout.warn")
        # internal config: ui.signal-safe-lock
        signalsafe = self.ui.configbool('ui', 'signal-safe-lock')

        l = lockmod.trylock(
            self.ui,
            vfs,
            lockname,
            timeout,
            warntimeout,
            releasefn=releasefn,
            acquirefn=acquirefn,
            desc=desc,
            inheritchecker=inheritchecker,
            parentlock=parentlock,
            signalsafe=signalsafe,
        )
        return l

    def _afterlock(self, callback):
        """add a callback to be run when the repository is fully unlocked

        for ref in (self._wlockref, self._lockref):
            l = ref and ref()
            if l and l.held:
                l.postrelease.append(callback)
                break
        else:  # no lock have been found.
            callback()

    def lock(self, wait=True):
        '''Lock the repository store (.hg/store) and return a weak reference
        to the lock. Use this before modifying the store (e.g. committing or

        l = self._currentlock(self._lockref)
        if l is not None:
            l.lock()
            return l

        l = self._lock(
            vfs=self.svfs,
            lockname="lock",
            wait=wait,
            releasefn=None,
            acquirefn=self.invalidate,
            desc=_('repository %s') % self.origroot,
        )
        self._lockref = weakref.ref(l)
        return l

    def _wlockchecktransaction(self):
        if self.currenttransaction() is not None:
            raise error.LockInheritanceContractViolation(
                'wlock cannot be inherited in the middle of a transaction'
            )

    def wlock(self, wait=True):
        '''Lock the non-store parts of the repository (everything under
        .hg except .hg/store) and return a weak reference to the lock.

            l.lock()
            return l

        # We do not need to check for non-waiting lock acquisition.  Such
        # acquisition would not cause dead-lock as they would just fail.
        if wait and (
            self.ui.configbool('devel', 'all-warnings')
            or self.ui.configbool('devel', 'check-locks')
        ):
            if self._currentlock(self._lockref) is not None:
                self.ui.develwarn('"wlock" acquired after "lock"')

        def unlock():
            if self.dirstate.pendingparentchange():

            else:
                self.dirstate.write(None)

            self._filecache['dirstate'].refresh()

        l = self._lock(
            self.vfs,
            "wlock",
            wait,
            unlock,
            self.invalidatedirstate,
            _('working directory of %s') % self.origroot,
            inheritchecker=self._wlockchecktransaction,
            parentenvvar='HG_WLOCK_LOCKER',
        )
        self._wlockref = weakref.ref(l)
        return l

    def _currentlock(self, lockref):
        """Returns the lock if it's held, or None if it's not."""

    def currentwlock(self):
        """Returns the wlock if it's held, or None if it's not."""
        return self._currentlock(self._wlockref)

    def _filecommit(
        self,
        fctx,
        manifest1,
        manifest2,
        linkrev,
        tr,
        changelist,
        includecopymeta,
    ):
        """
        commit an individual file as part of a larger transaction
        """

        fname = fctx.path()

        fparent2 = manifest2.get(fname, nullid)
        if isinstance(fctx, context.filectx):
            node = fctx.filenode()
            if node in [fparent1, fparent2]:
                self.ui.debug('reusing %s filelog entry\n' % fname)
                if (
                    fparent1 != nullid
                    and manifest1.flags(fname) != fctx.flags()
                ) or (
                    fparent2 != nullid
                    and manifest2.flags(fname) != fctx.flags()
                ):
                    changelist.append(fname)
                return node

        flog = self.file(fname)
        meta = {}

            #

            cnode = manifest1.get(cfname)
            newfparent = fparent2

            if manifest2:  # branch merge
                if fparent2 == nullid or cnode is None:  # copied on remote side
                    if cfname in manifest2:
                        cnode = manifest2[cfname]
                        newfparent = fparent1

            # Here, we used to search backwards through history to try to find

                if includecopymeta:
                    meta["copy"] = cfname
                    meta["copyrev"] = hex(cnode)
                fparent1, fparent2 = nullid, newfparent
            else:
                self.ui.warn(
                    _(
                        "warning: can't find ancestor for '%s' "
                        "copied from '%s'!\n"
                    )
                    % (fname, cfname)
                )

        elif fparent1 == nullid:
            fparent1, fparent2 = fparent2, nullid
        elif fparent2 != nullid:
            # is one parent an ancestor of the other?

                f = self.dirstate.normalize(f)
                if f == '.' or f in matched or f in wctx.substate:
                    continue
                if f in status.deleted:
                    fail(f, _('file not found!'))
                if f in vdirs:  # visited directory
                    d = f + '/'
                    for mf in matched:
                        if mf.startswith(d):
                            break
                    else:
                        fail(f, _("no match under directory!"))
                elif f not in self.dirstate:
                    fail(f, _("file not tracked!"))

    @unfilteredmethod
    def commit(
        self,
        text="",
        user=None,
        date=None,
        match=None,
        force=False,
        editor=False,
        extra=None,
    ):
        """Add a new revision to current repository.

        Revision information is gathered from the working directory,
        match can be used to filter the committed files. If editor is
        supplied, it is called to get a commit message.

        with self.wlock(), self.lock():
            wctx = self[None]
            merge = len(wctx.parents()) > 1

            if not force and merge and not match.always():
                raise error.Abort(
                    _(
                        'cannot partially commit a merge '
                        '(do not specify files or patterns)'
                    )
                )

            status = self.status(match=match, clean=force)
            if force:
                status.modified.extend(
                    status.clean
                )  # mq may commit clean files

            # check subrepos
            subs, commitsubs, newstate = subrepoutil.precommit(
                self.ui, wctx, status, match, force=force
            )

            # make sure all explicit patterns are matched
            if not force:
                self.checkcommitpatterns(wctx, vdirs, match, status, fail)

            cctx = context.workingcommitctx(
                self, status, text, user, date, extra
            )

            # internal config: ui.allowemptycommit
            allowemptycommit = (
                wctx.branch() != wctx.p1().branch()
                or extra.get('close')
                or merge
                or cctx.files()
                or self.ui.configbool('ui', 'allowemptycommit')
            )
            if not allowemptycommit:
                return None

            if merge and cctx.deleted():
                raise error.Abort(_("cannot commit merge with missing files"))

            ms = mergemod.mergestate.read(self)
            mergeutil.checkunresolved(ms)

            if editor:
                cctx._text = editor(self, cctx, subs)
            edited = text != cctx._text

            # Save commit message in case this transaction gets rolled back
            # (e.g. by a pretxncommit hook).  Leave the content alone on
            # the assumption that the user will use the same editor again.
            msgfn = self.savecommitmessage(cctx._text)

            # commit subs and write new state
            if subs:
                uipathfn = scmutil.getuipathfn(self)
                for s in sorted(commitsubs):
                    sub = wctx.sub(s)
                    self.ui.status(
                        _('committing subrepository %s\n')
                        % uipathfn(subrepoutil.subrelpath(sub))
                    )
                    sr = sub.commit(cctx._text, user, date)
                    newstate[s] = (newstate[s][0], sr)
                subrepoutil.writestate(self, newstate)

            p1, p2 = self.dirstate.parents()
            hookp1, hookp2 = hex(p1), (p2 != nullid and hex(p2) or '')
            try:
                self.hook(
                    "precommit", throw=True, parent1=hookp1, parent2=hookp2
                )
                with self.transaction('commit'):
                    ret = self.commitctx(cctx, True)
                    # update bookmarks, dirstate and mergestate
                    bookmarks.update(self, [p1, p2], ret)
                    cctx.markcommitted(ret)
                    ms.reset()
            except:  # re-raises
                if edited:
                    self.ui.write(
                        _('note: commit message saved in %s\n') % msgfn
                    )
                raise

        def commithook():
            # hack for command that use a temporary commit (eg: histedit)
            # temporary commit got stripped before hook release
            if self.changelog.hasnode(ret):
                self.hook(
                    "commit", node=hex(ret), parent1=hookp1, parent2=hookp2
                )

        self._afterlock(commithook)
        return ret

    @unfilteredmethod
    def commitctx(self, ctx, error=False, origctx=None):

        p1, p2 = ctx.p1(), ctx.p2()
        user = ctx.user()

        writecopiesto = self.ui.config('experimental', 'copies.write-to')
        writefilecopymeta = writecopiesto != 'changeset-only'
        writechangesetcopy = writecopiesto in (
            'changeset-only',
            'compatibility',
        )
        p1copies, p2copies = None, None
        if writechangesetcopy:
            p1copies = ctx.p1copies()
            p2copies = ctx.p2copies()
        filesadded, filesremoved = None, None

                        fctx = ctx[f]
                        if fctx is None:
                            removed.append(f)
                        else:
                            added.append(f)
                            m[f] = self._filecommit(
                                fctx,
                                m1,
                                m2,
                                linkrev,
                                trp,
                                changed,
                                writefilecopymeta,
                            )
                            m.setflag(f, fctx.flags())
                    except OSError:
                        self.ui.warn(
                            _("trouble committing %s!\n") % uipathfn(f)
                        )
                        raise
                    except IOError as inst:
                        errcode = getattr(inst, 'errno', errno.ENOENT)
                        if error or errcode and errcode != errno.ENOENT:
                            self.ui.warn(
                                _("trouble committing %s!\n") % uipathfn(f)
                            )
                        raise

                # update manifest
                removed = [f for f in removed if f in m1 or f in m2]
                drop = sorted([f for f in removed if f in m])
                for f in drop:
                    del m[f]
                if p2.rev() != nullrev:

                    @util.cachefunc
                    def mas():
                        p1n = p1.node()
                        p2n = p2.node()
                        cahs = self.changelog.commonancestorsheads(p1n, p2n)
                        if not cahs:
                            cahs = [nullrev]
                        return [self[r].manifest() for r in cahs]

                    def deletionfromparent(f):
                        # When a file is removed relative to p1 in a merge, this
                        # function determines whether the absence is due to a
                        # deletion from a parent, or whether the merge commit
                        # itself deletes the file. We decide this by doing a

                        # described above is not done directly in _filecommit
                        # when creating the list of changed files, however
                        # it does something very similar by comparing filelog
                        # nodes.
                        if f in m1:
                            return f not in m2 and all(
                                f in ma and ma.find(f) == m1.find(f)
                                for ma in mas()
                            )
                        elif f in m2:
                            return all(
                                f in ma and ma.find(f) == m2.find(f)
                                for ma in mas()
                            )
                        else:
                            return True

                    removed = [f for f in removed if not deletionfromparent(f)]

                files = changed + removed
                md = None
                if not files:
                    # if no "files" actually changed in terms of the changelog,
                    # try hard to detect unmodified manifest entry so that the
                    # exact same commit can be reproduced later on convert.
                    md = m1.diff(m, scmutil.matchfiles(self, ctx.files()))
                if not files and md:
                    self.ui.debug(
                        'not reusing manifest (no file change in '
                        'changelog, but manifest differs)\n'
                    )
                if files or md:
                    self.ui.note(_("committing manifest\n"))
                    # we're using narrowmatch here since it's already applied at
                    # other stages (such as dirstate.walk), so we're already
                    # ignoring things outside of narrowspec in most cases. The
                    # one case where we might have files outside the narrowspec
                    # at this point is merges, and we already error out in the
                    # case where the merge has files outside of the narrowspec,
                    # so this is safe.
                    mn = mctx.write(
                        trp,
                        linkrev,
                        p1.manifestnode(),
                        p2.manifestnode(),
                        added,
                        drop,
                        match=self.narrowmatch(),
                    )

                    if writechangesetcopy:
                        filesadded = [
                            f for f in changed if not (f in m1 or f in m2)
                        ]
                        filesremoved = removed
                else:
                    self.ui.debug(
                        'reusing manifest from p1 (listed files '
                        'actually unchanged)\n'
                    )
                    mn = p1.manifestnode()
            else:
                self.ui.debug('reusing manifest from p1 (no file change)\n')
                mn = p1.manifestnode()
                files = []

                files = origctx.files()

            # update changelog
            self.ui.note(_("committing changelog\n"))
            self.changelog.delayupdate(tr)
            n = self.changelog.add(
                mn,
                files,
                ctx.description(),
                trp,
                p1.node(),
                p2.node(),
                user,
                ctx.date(),
                ctx.extra().copy(),
                p1copies,
                p2copies,
                filesadded,
                filesremoved,
            )
            xp1, xp2 = p1.hex(), p2 and p2.hex() or ''
            self.hook(
                'pretxncommit',
                throw=True,
                node=hex(n),
                parent1=xp1,
                parent2=xp2,
            )
            # set the new commit is proper phase
            targetphase = subrepoutil.newcommitphase(self.ui, ctx)
            if targetphase:
                # retract boundary do not alter parent changeset.
                # if a parent have higher the resulting phase will

        # head, refresh the tag cache, then immediately add a new head.
        # But I think doing it this way is necessary for the "instant
        # tag cache retrieval" case to work.
        self.invalidate()

    def status(
        self,
        node1='.',
        node2=None,
        match=None,
        ignored=False,
        clean=False,
        unknown=False,
        listsubrepos=False,
    ):
        '''a convenience method that calls node1.status(node2)'''
        return self[node1].status(
            node2, match, ignored, clean, unknown, listsubrepos
        )

    def addpostdsstatus(self, ps):
        """Add a callback to run within the wlock, at the point at which status
        fixups happen.

            if exc.hint:
                self.ui.write_err(_("(%s)\n") % exc.hint)
            return False
        self.ui.debug('pushing key for "%s:%s"\n' % (namespace, key))
        ret = pushkey.push(self, namespace, key, old, new)

        def runhook():
            self.hook(
                'pushkey',
                namespace=namespace,
                key=key,
                old=old,
                new=new,
                ret=ret,
            )

        self._afterlock(runhook)
        return ret

    def listkeys(self, namespace):
        self.hook('prelistkeys', throw=True, namespace=namespace)

        self.hook('listkeys', namespace=namespace, values=values)
        return values

    def debugwireargs(self, one, two, three=None, four=None, five=None):
        '''used to test argument passing over the wire'''
        return "%s %s %s %s %s" % (
            one,
            two,
            pycompat.bytestr(three),
            pycompat.bytestr(four),
            pycompat.bytestr(five),
        )

    def savecommitmessage(self, text):
        fp = self.vfs('last-message.txt', 'wb')
        try:
            fp.write(text)
        finally:
            fp.close()
        return self.pathto(fp.name[len(self.root) + 1 :])


# used to avoid circular references so destructors work
def aftertrans(files):
    renamefiles = [tuple(t) for t in files]

    def a():
        for vfs, src, dest in renamefiles:
            # if src and dest refer to a same file, vfs.rename is a no-op,
            # leaving both src and dest on disk. delete dest to make sure
            # the rename couldn't be such a no-op.
            vfs.tryunlink(dest)
            try:
                vfs.rename(src, dest)
            except OSError:  # journal file does not yet exist
                pass

    return a


def undoname(fn):
    base, name = os.path.split(fn)
    assert name.startswith('journal')
    return os.path.join(base, name.replace('journal', 'undo', 1))


def instance(ui, path, create, intents=None, createopts=None):
    localpath = util.urllocalpath(path)
    if create:
        createrepository(ui, localpath, createopts=createopts)

    return makelocalrepository(ui, localpath, intents=intents)


def islocal(path):
    return True


def defaultcreateopts(ui, createopts=None):
    """Populate the default creation options for a repository.

    A dictionary of explicitly requested creation options can be passed

    if 'backend' not in createopts:
        # experimental config: storage.new-repo-backend
        createopts['backend'] = ui.config('storage', 'new-repo-backend')

    return createopts


def newreporequirements(ui, createopts):
    """Determine the set of requirements for a new local repository.

    Extensions can wrap this function to specify custom requirements for

            requirements.add('shared')

        return requirements

    if 'backend' not in createopts:
        raise error.ProgrammingError(
            'backend key not present in createopts; '
            'was defaultcreateopts() called?'
        )

    if createopts['backend'] != 'revlogv1':
        raise error.Abort(
            _(
                'unable to determine repository requirements for '
                'storage backend: %s'
            )
            % createopts['backend']
        )

    requirements = {'revlogv1'}
    if ui.configbool('format', 'usestore'):
        requirements.add('store')
        if ui.configbool('format', 'usefncache'):

            if ui.configbool('format', 'dotencode'):
                requirements.add('dotencode')

    compengine = ui.config('format', 'revlog-compression')
    if compengine not in util.compengines:
        raise error.Abort(
            _(
                'compression engine %s defined by '
                'format.revlog-compression not available'
            )
            % compengine,
            hint=_(
                'run "hg debuginstall" to list available ' 'compression engines'
            ),
        )

    # zlib is the historical default and doesn't need an explicit requirement.
    elif compengine == 'zstd':
        requirements.add('revlog-compression-zstd')
    elif compengine != 'zlib':

    if ui.configbool('format', 'bookmarks-in-store'):
        requirements.add(bookmarks.BOOKMARKS_IN_STORE_REQUIREMENT)

    return requirements


def filterknowncreateopts(ui, createopts):
    """Filters a dict of repo creation options against options that are known.

    Receives a dict of repo creation options and returns a dict of those

        'shareditems',
        'shallowfilestore',
    }

    return {k: v for k, v in createopts.items() if k not in known}


def createrepository(ui, path, createopts=None):
    """Create a new repository in a vfs.

    ``path`` path to the new repo's working directory.

    createopts = defaultcreateopts(ui, createopts=createopts)

    unknownopts = filterknowncreateopts(ui, createopts)

    if not isinstance(unknownopts, dict):
        raise error.ProgrammingError(
            'filterknowncreateopts() did not return ' 'a dict'
        )

    if unknownopts:
        raise error.Abort(
            _(
                'unable to create repository because of unknown '
                'creation option: %s'
            )
            % ', '.join(sorted(unknownopts)),
            hint=_('is a required extension not loaded?'),
        )

    requirements = newreporequirements(ui, createopts=createopts)

    wdirvfs = vfsmod.vfs(path, expandpath=True, realpath=True)

            try:
                sharedpath = os.path.relpath(sharedpath, hgvfs.base)
            except (IOError, ValueError) as e:
                # ValueError is raised on Windows if the drive letters differ
                # on each path.
                raise error.Abort(
                    _('cannot calculate relative path'),
                    hint=stringutil.forcebytestr(e),
                )

    if not wdirvfs.exists():
        wdirvfs.makedirs()

    hgvfs.makedir(notindexed=True)

        # effectively locks out old clients and prevents them from
        # mucking with a repo in an unknown format.
        #
        # The revlog header has version 2, which won't be recognized by
        # such old clients.
        hgvfs.append(
            b'00changelog.i',
            b'\0\0\0\2 dummy changelog to prevent using the old repo '
            b'layout',
        )

    scmutil.writerequires(hgvfs, requirements)

    # Write out file telling readers where to find the shared store.
    if 'sharedrepo' in createopts:
        hgvfs.write(b'sharedpath', sharedpath)

    if createopts.get('shareditems'):
        shared = b'\n'.join(sorted(createopts['shareditems'])) + b'\n'
        hgvfs.write(b'shared', shared)


def poisonrepository(repo):
    """Poison a repository instance so it can no longer be used."""
    # Perform any cleanup on the instance.
    repo.close()

    class poisonedrepository(object):
        def __getattribute__(self, item):
            if item == r'close':
                return object.__getattribute__(self, item)

            raise error.ProgrammingError(
                'repo instances should not be used ' 'after unshare'
            )

        def close(self):
            pass

    # We may have a repoview, which intercepts __setattr__. So be sure